Postfix: The Definitive Guide

Index

A note on the digital index

A link in an index entry is displayed as the section title in which that entry appears. Because some sections have multiple index markers, it is not unusual for an entry to have several links to the same section. Clicking on any link will take you directly to the place in the text in which the marker appears.

Symbols

! (exclamation point)

marking messages in hold queue, Listing the Queue
preventing rewriting of domain names, Masquerading Hostnames

" (quotation marks)

in alias definitions, Alias file format
lookup tables and, Lookup table format
parameter values and, The main.cf Configuration File

# (root prompt), Command Prompts

$ (dollar sign)

command prompt, Command Prompts
in configuration variables, Configuration variables

% (command prompt), Command Prompts

* (asterisk), for messages in active queue, Listing the Queue

.forward files, .forward Files

/ (slash)

in file pointers, Multiple values
in regular expression keys, Regular expression tables

/etc/passwd file, Login Names and UID Numbers

2bounce_notice_recipient parameter, Default:

? (question mark), ending wakeup time with, master.cf

\ (backslash), continuing long command lines in Unix, Long Lines

| (vertical bar), commands as alias targets, Alias file format

A

A records, DNS Overview

domains without, Common Problems
for mail exchangers, Email Routing
MTA routing of email with, Email Routing
for MX hosts, Common Problems

access maps

client checking with, Restriction Definitions, Access maps

actions to take after checking, Access maps
example configuration, Access maps

regular expression tables for, Access maps

access_map_reject_code PARameter, Default:

account names, excluding from masquerading, Masquerading Hostnames

active attacks, Specifying mechanisms

active queue, The Postfix Queue, Tracing a Message Through Postfix, Queue Management, How qmgr Works

messages marked with asterisk (*), Listing the Queue

additional_conditions parameter, MySQL parameters, Configuring local_recipient_maps, Configuring alias_maps

address classes, Mail Delivery

masquerading all, Masquerading Hostnames

addresses, email

address completion, turning off, Rewriting Addresses

as alias targets, Alias file format

blocking spam from (see spam)

client-based rules, restrictions to check, Access maps

correction by cleanup daemon, Tracing a Message Through Postfix

creating text file for mailing lists, Separate List Files

deleting queued messages by, Deleting Messages

format in message header (RFC 2822), RFC 2822 messages

handling by trivial-rewrite daemon, Local Email Submission

identifying spam from, Client-Based Spam Detection

legitimate return address appropriated by spammers, The Problem of Spam

rewriting, Rewriting Addresses–Unknown Users

canonical addresses, Canonical Addresses
with canonical_maps lookup table, Lookup Tables
masquerading hostnames, Masquerading Hostnames
relocated users, Relocated Users
unknown users, Unknown Users

sender and recipient, sent during SMTP transaction, The SMTP Conversation (Briefly)

administration, Administration–Queue Management

logging, Logging

pseudo account for processes, Pseudo-Accounts

queue management (see queue manager)

root privileges and, The Superuser

running Postfix at system startup, Running Postfix at System Startup–Do it yourself

writing an initialization script, Do it yourself

starting, stopping, and reloading Postfix, Starting, Stopping, and Reloading Postfix

administrator, email (postmaster), The Postmaster

agents, email, Email Agents

(see also MDAs; MTAs; MUAs)
listing of, Email Agents

alias files, Alias Files

building alias database files, Building alias database files
delivery to command or file specified in, Alias Deliveries
format of, Alias file format
important aliases, Important aliases
locating aliases, Locating aliases
restrictions on targets, Alias restrictions

aliases, Local Parts of Email Addresses

checking before local part of email address, Local Delivery

checking by local delivery agent, Local Delivery

hostname, canonical name for (CNAME), DNS Overview

hosts in MX records, Email Routing

mailing list

owner, Mailing-List Owners
sending message to test list, Testing Your List

mailing list,

creating, Simple Mailing Lists

Mailman

creating file for storing, Creating a Mailman list

Majordomo, creating file for, Creating a Majordomo list

system database of, correct format, Starting Postfix the First Time

virtual, Virtual Aliases

catchall addresses with, Virtual alias catchall
lookup table for, Configuring a Virtual Auto-Responder

virtual alias

addresses, Virtual Alias Messages
lookup file, Separate Domains with System Accounts

alias_database parameter, Building alias database files, Additional Alias Files

adding Mailman alias file to, Creating a Mailman list
adding Majordomo alias file to, Creating a Majordomo list

alias_maps parameter, Locating aliases, Simple Mailing Lists, Default: hash:/etc/aliases, nis

adding Mailman alias file to, Creating a Mailman list
additional alias files for mailing list, Additional Alias Files
configuring for MySQL/Postfix, Configuring alias_maps
editing to add Majordomo alias file, Creating a Majordomo list
LDAP, setting for, LDAP Configuration

allow_mail_to_commands, Alias restrictions

allow_mail_to_files parameter, Alias restrictions, Default:

allow_percent_hack parameter, Default:

alternate_config_directories parameter, Default:

ANONYMOUS authentication mechanism, Choosing an Authentication Mechanism

anonymous logins, Specifying mechanisms

append_at_myorigin parameter, Default:

turning off address completion, Rewriting Addresses

append_dot_mydomain parameter

turning off address completion, Rewriting Addresses

approve command (Majordomo), Majordomo

architecture, Postfix, Postfix Architecture–Tracing a Message Through Postfix

components, Postfix Components

how messages enter Postfix system, How Messages Enter the Postfix System–Email Forwarding

email forwarding, Email Forwarding
email notifications, Postfix Email Notifications
local email submission, Local Email Submission
network email, Email from the Network

mail delivery, Mail Delivery–Pipe delivery

local, Local Delivery
other delivery agents, Other Delivery Agents
other messages, Other Messages
relay messages, Relay Messages
virtual alias messages, Virtual Alias Messages
virtual mailbox messages, Virtual Mailbox Messages

queue manager, The Postfix Queue

tracing a message through, Tracing a Message Through Postfix–Tracing a Message Through Postfix

arrival time, messages in queue, Listing the Queue

ASCII characters in email message body, RFC 2822 messages

assignment with a comment (parameter example), The main.cf Configuration File

attached message headers, checking for, Content-Checking

attachments with file extensions, rejecting all messages with, Comparing Patterns

attacks

active, Specifying mechanisms
dictionary (see dictionary attacks)
distributed denial-of-service, use of hijacked systems for, DNS-based blacklists
indicated by increasingly frequent errors from a client, Receiving Limits
malicious program sending garbage commands, Receiving Limits

AUTH SMTP command, Testing Your Authentication Configuration

authentication

certificate, Certificate authentication, Transport Layer Security, Transport Layer Security

(see also TLS)

client-side certificates, Requiring Client-Side Certificates–Configuring client-side certificate authentication

framework, SASL Overview

choosing, Choosing an Authentication Framework
specifying for SASL use with Postfix, Specifying a Framework–SASL passwords, Unix passwords, SASL passwords

identity, Testing Your Authentication Configuration

IMAP server, Cyrus SASL library, A Postfix and Cyrus IMAP Example

mechanism, SASL Overview

choosing, Choosing an Authentication Mechanism

SASL (see SASL)

SMTP, SMTP Client Authentication

relay control with, SMTP authentication

authoritative domain nameservers, DNS Overview

authorization identity, Testing Your Authentication Configuration

authorized_verp_clients parameter, Default:

auto-responders, configuring virtual, Configuring a Virtual Auto-Responder–Configuring a Virtual Auto-Responder

automatic reply program, Delivery to Commands

auto_transition feature of Cyrus SASL, SASL passwords

auxiliary property plug-ins, SASL passwords

B

backscatter, The Problem of Spam

backup MX, Backup MX–Fast Flushing

base64 encoding of credentials, Testing Your Authentication Configuration

Berkeley DB, Cyrus IMAP and, A Postfix and Cyrus IMAP Example

berkeley_db_read_buffer_size parameter, Default:

biff, Default:

bin and daemon (pseudo accounts), Pseudo-Accounts

binary format, aliases file, Starting Postfix the First Time

BIND (DNS server application), Email Routing

blacklisted sites

DNS-based Blacklists (DNSBL), DNS-based blacklists

realtime blacklist checking restrictions, Restriction Definitions

realtime blacklists

client restrictions based on, Real-time blacklists

body of email messages, RFC 2822 messages

checks during client-based spam detection, The SMTP Conversation (Briefly)
content filtering with body checks, Content Filtering

body_checks parameter, Regular expression tables, Content-Checking

pattern comparison in, Comparing Patterns

body_checks_size_limit parameter, Comparing Patterns, Default:

bounce daemon, Postfix Email Notifications

bounced messages, Reject or Bounce

mailing list, Testing Your List
spam sent to non-existent users, The Problem of Spam

bounce_service_name parameter, Default:

bounce_size_limit parameter, Deferred Mail

broken_sasl_auth_clients parameter, Enabling SASL

btree (lookup table database), Database formats

buffer overflow attacks, Security by Design

building Postfix, Additional Information and How to Obtain Postfix, Building Postfix, Building Postfix

(see also compiling Postfix)
customizing your build, Customizing Your Build
modifying defaults, Modifying Postfix Defaults

C

C code, compiling, Postfix Compiling Primer

CA (see Certificate Authority)

canonical addresses, Canonical Addresses

canonical domain, Hosting Multiple Domains

canonical names for hostname aliases, DNS Overview

canonical_maps parameter, Lookup Tables, Search order, Canonical Addresses, Default:

assigning lookup table to, Separate Domains with System Accounts

Carnegie Mellon University, Cyrus IMAP, Local Mail Transfer Protocol

catchall addresses, Catchall Addresses

virtual alias, Virtual alias catchall
virtual mailbox, Virtual mailbox catchall

Certificate Authority (CA), Postfix and TLS

client certificates signed by, Requiring Client-Side Certificates
digital signature of public keys, Postfix and TLS
public certificates identifying, Postfix/TLS Configuration

certificate signing request (CSR), Generating Server Certificates

certificates, Transport Layer Security

authentication by, Certificate authentication

CA, installing, Installing CA Certificates

TLS, TLS Certificates

becoming a CA, Becoming a CA
client-side, Requiring Client-Side Certificates–Configuring client-side certificate authentication
public-key cryptography, use of, Postfix and TLS

check_client_access restriction, Access maps

check_helo_access restriction, Access maps

check_recipient_access restriction, Access maps

check_sender_access restriction, Access maps

chroot, Security by Design, chroot

executing correct script for your system, chroot
in main.cf file, master.cf
Postfix running in, DNS file and, Common Problems

classes

address, Mail Delivery
error, Error Notifications

class_notice_recipient parameter, Error Notifications

class_transport parameter, Other Delivery Agents

cleanup daemon, Local Email Submission, Email from the Network

error messages, checking, Postfix Email Notifications
fixing email addresses, Tracing a Message Through Postfix
queue manager, notifying of incoming mail, The Postfix Queue

client certificates

common name, Configuring TLS/SMTP Client
creating, Creating client certificates
fingerprints for, Configuring client-side certificate authentication

client errors, increasingly frequent, Receiving Limits

client-based spam detection, Client-Based Spam Detection

configuring rules for, Postfix Configuration

defining rules with restriction classes, Postfix Configuration

DNS-based blacklists, DNS-based blacklists

rules, restrictions assigned to, Client-Detection Rules

access maps, Access maps
DNS restrictions, DNS restrictions
generic restrictions, Generic restrictions
how restrictions work, How restrictions work
listing restrictions, Listing Restrictions
other restrictions, Other client-checking restrictions
realtime blacklists, Real-time blacklists
restriction definitions, Restriction Definitions
SMTP conversations, The SMTP Conversation (Briefly)
SMTP rules and restrictions, Listing Restrictions
strict syntax restrictions, Strict syntax restrictions
testing new restrictions, Testing new restrictions

spammer tactics to circumvent, Detection Difficulties

client-side certificate authentication (see certificates)

client/server authentication, agreement on mechanism, Choosing an Authentication Mechanism

clientcerts file, Configuring client-side certificate authentication

client_access file, Access maps

CNAME records, DNS Overview, Email Routing

command prompts, Unix, Command Prompts

command used to execute a service (master.cf), master.cf

command-line tools

for managing certificates, TLS Certificates

queues, Queue Tools–Flushing Messages

deleting messages, Deleting Messages
displaying messages, Displaying Messages
flushing messages, Flushing Messages
holding messages, Holding Messages
listing messages, Listing the Queue
requeuing messages, Requeuing Messages

resolving domain names, DNS and Sending Mail

commands

as alias targets, Alias file format

content filtering, Content Filtering, Command-Based Filtering–Configuration

configuration, Configuration

delivery to, Delivery to Commands–Configuring a Virtual Mailing List Manager

automatic reply program, Delivery to Commands
configuring virtual auto-responder, Configuring a Virtual Auto-Responder–Configuring a Virtual Auto-Responder
configuring virtual mailing list manager, Configuring a Virtual Mailing List Manager

executing your own with pipe daemon, master.cf

Postfix, Postfix Commands

default directory for, General Configuration and Administration

specified in alias files, deliveries to, Alias Deliveries

Unix, documentation in man pages, ManPages

command_directory parameter, Default:

command_time_limit parameter, Default:

comments (in main.cf file), The main.cf Configuration File

common name

client certificate, Configuring TLS/SMTP Client
public key, Postfix and TLS

compiling Postfix, Compiling Add-on Packages

(see also building Postfix)

add-on packages, Compiling Add-on Packages

Cyrus SASL, Cyrus SASL
LDAP, LDAP
MySQL, MySQL
TLS, TLS

common problems, Common Problems

compiler options, Compiler Options

linker options, Linker Options

primer, Postfix Compiling Primer

script to create a Makefile, Wrapping Things Up

completion of email addresses, turning off, Rewriting Addresses

components, Postfix, Postfix Components

concurrent delivery attempts, Message Delivery

configuration, General Configuration and Administration–Documentation, Multiple values

(see also configuration files)

chroot environment, chroot

default directories, General Configuration and Administration

default, as Unix mail server, General Configuration and Administration

MTA identity, Configuring Your MTA Identity

mydestination parameter, mydestination
myhostname and mydomain parameters, myhostname and mydomain
myorigin parameter, myorigin

parameters, Configuration Parameters–Example:

Postfix anti-spam example, Postfix Anti-Spam Example

Postfix/TLS, Postfix/TLS Configuration

summary of, Postfix/TLS Configuration Summary

receiving limits, Receiving Limits

relay (mail delivery agents) control

certificate authentication, Certificate authentication

relay control, Relay Control

dynamic IP solutions, Dynamic IP solutions
restricting relay access, Restricting relay access
SMTP authentication, SMTP authentication

rewriting addresses, Rewriting Addresses–Unknown Users

canonical addresses, Canonical Addresses
masquerading hostnames, Masquerading Hostnames
relocated users, Relocated Users
unknown users, Unknown Users

spam checks for Postfix, Postfix Configuration–Postfix Anti-Spam Example

categories of spam detection, Postfix Configuration
client-detection rules, Client-Detection Rules–Tracing a Restriction List
content checking, Content-Checking–Comparing Patterns
customized restriction classes, Customized Restriction Classes
strict syntax parameters, Strict Syntax Parameters

starting Postfix, first time, Starting Postfix the First Time

aliases file, system, Starting Postfix the First Time
hostname, Starting Postfix the First Time

configuration files, Configuration Files–Multiple values

/etc/postfix directory, Configuration Files

alias files, Alias Files

alias database, building, Building alias database files
format of, Alias file format
important aliases, Important aliases
locating aliases, Locating aliases
restrictions on targets, Alias restrictions

BIND, for a domain, Email Routing

Cyrus, A Postfix and Cyrus IMAP Example

default directory for, General Configuration and Administration

lookup tables, Lookup Tables–Other Formats

database formats, Database formats
format of, Lookup table format
other formats, Other Formats
parameters that take lists, Lookup tables and simple lists
regular expressions, using, Regular expression tables
search order, Search order

main.cf file, The main.cf Configuration File

configuration variables, Configuration variables
line continuation, Line continuation
multiple values for parameters, Multiple values

majordomo.cf, Creating a Majordomo list

master daemon (main.cf and master.cf), Postfix Components

master.cf (see master.cf file)

mysql-local.cf, Configuring local_recipient_maps

sample, The main.cf Configuration File, Documentation

content filtering, Content Filtering–Other Considerations

address rewriting and, Other Considerations

command-based, Command-Based Filtering–Configuration

configuration of, Configuration

configuring external filters, Content Filtering

daemon-based, Daemon-Based Filtering–Daemon-Based Filter Example

configuration of, Configuration–Turning on filtering
example of, Daemon-Based Filter Example

filters configured to accept mail before MTA, Other Considerations

mail delivery agents (MDAs), Content Filtering

mail transfer agents (MTAs), Content Filtering

mail user agents (MUAs), Content Filtering

MTA and MUA filters, combining, Content Filtering

Postfix body and header checks, Content Filtering

running multiple filters by chaining them, Other Considerations

content filters, Content Filtering

evading with HTML code in message body, Comparing Patterns
redirecting message to after client access map check, Access maps
separate, sending messge through after content checking, Content Checking Actions
separate, using to detect spam, Content-Checking

content-based spam detection, Content-Based Spam Detection

comparing patterns, Comparing Patterns
configuring Postfix for, Postfix Configuration
content checking actions, Content Checking Actions
content checking configuration, Content Checking Configuration
content checking parameters, Content-Checking
labeling spam with content filters, Anti-Spam Actions
spammer tactics to circumvent, Detection Difficulties

content_filter parameter, Configuration, Default:

turning on daemon-based filtering, Turning on filtering

continuation of lines

email message header fields, RFC 2822 messages
in lookup table files, Lookup table format
main.cf file, Line continuation

corrupt queue, The Postfix Queue, Queue Management, Corrupt Messages

credentials, Testing Your Authentication Configuration

authentication mechanism for exchanging, SASL Overview
encoded exchange of, Choosing an Authentication Mechanism
encryption with TLS, Transport Layer Security
OTP authentication, for SMTP clients, Choosing an Authentication Mechanism

cryptography, public-key, Postfix and TLS

client certificates, Creating client certificates
generating server certificates, Generating Server Certificates

CSR (certificate signing request), Generating Server Certificates

cur directory, The Maildir Format

Cyrus IMAP

Postfix and, Postfix and Cyrus IMAP

example, A Postfix and Cyrus IMAP Example

server, Local Mail Transfer Protocol

Cyrus SASL libraries, A Postfix and Cyrus IMAP Example, SASL Authentication, Postfix and SASL

SASL and SASLv2 development tracks, Postfix and SASL
saslauthd authentication server, Unix passwords

D

daemon (pseudo account), Pseudo-Accounts

daemons, Postfix Components

chrooted, making all resources available to, chroot

content filtering, Content Filtering, Daemon-Based Filtering–Daemon-Based Filter Example

configuration, Configuration–Turning on filtering
example of, Daemon-Based Filter Example

default Postfix directory for, General Configuration and Administration

master daemon, control by, Configuration Files

options for, master.cf

daemon_directory parameter, master.cf

DATA command (SMTP), The SMTP Protocol, The SMTP Conversation (Briefly)

database formats in lookup tables, Database formats

databases, external, External Databases–Configuring transport_maps

LDAP, LDAP–Configuring transport_maps

configuration, LDAP Configuration
example Postfix/LDAP configuration, LDAP Example

MySQL, MySQL

configuration, MySQL Configuration
MySQL/Postfix configuration example, MySQL Example

days (d), master.cf

dbm (lookup table database), Database formats

dbname parameter, MySQL parameters

debugging

domain name resolution, DNS and Sending Mail
enabling information for, master.cf
tracing service failures in chroot, chroot

debug_peer_list parameter, Default:

default_database_type parameter, Database formats, Building alias database files

default_destination_concurrency_limit parameter, Message Delivery, Default:

default_destination_recipient_limit parameter, Message Delivery

default_extra_recipient_limit parameter, Default:

default_privs parameter, Alias file format

default_process_limit parameter, master.cf, Message Delivery, Default:

default_recipient_limit parameter, Example:

default_verp_delimiters parameter, Default:

defer daemon, Postfix Email Notifications

deferred messages

deferring delivery, Other Messages, Deferring delivery
deferring mail relay, Deferring mail relay
reason for inability to deliver, Listing the Queue
time in queue, specifying, Backup MX

deferred queue, The Postfix Queue, Queue Management, Deferred Mail

redelivery attempts, scheduling, Queue Scheduling

defer_service_name parameter, Default:

defer_transports parameter, Deferring delivery

definitions

of aliases, Alias file format
parameter, in main.cf, The main.cf Configuration File

delayed messages, information about, The Postfix Queue

delays

introducing with each client error, Receiving Limits
scheduling delivery attempts for deferred mail, Queue Scheduling

delay_notice_recipient parameter, Default:

deleting queued messages, Deleting Messages

Delivered-To: header, Majordomo

delivery agents for email (see MDAs)

delivery attempts for deferred mail, scheduling, Queue Scheduling

delivery of mail, Postfix Components, Mail Delivery–Pipe delivery

disallowing/allowing to commands and files, Alias restrictions

handling by queue manager, Message Delivery

corrupt messages, Corrupt Messages
error notifications, Error Notifications

local messages, Local Delivery

message header To: address and, Envelope Addresses and Message Headers

with multiple recipients, The Role of Postfix

other delivery agents, Other Delivery Agents

LMTP, Delivery via LMTP
pipe daemon, Pipe delivery

other messages, Other Messages

Postfix, The Role of Postfix

queueing messages and retrying periodically, The Role of Postfix

relay messages, Relay Messages

spam, labeling as, Anti-Spam Actions

virtual alias messages, Virtual Alias Messages

virtual mailbox messages, Virtual Mailbox Messages

delivery transports, Postfix Delivery Transports

deliver_lock_attempts parameter, Default:

denial-of-service attacks (DOS), Security by Design

distributed, DNS-based blacklists

dictionary attacks

luser_relay parameter, using, Unknown Users
nodictionary password mechanism, Specifying mechanisms

dig tool, DNS and Sending Mail

DIGEST-MD5 mechanism, Choosing an Authentication Mechanism

digital signatures, Postfix and TLS

directories

default, for Postfix, General Configuration and Administration
Postfix configuration files, Configuration Files

disable_dns_lookups parameter, Default:

disable_mime_output_conversion parameter, Default:

disable_vrfy_command parameter, Default:

discarding messages, Access maps

after content checking, Content Checking Actions

displaying queued messages, Displaying Messages

distinguished name, Creating client certificates

distributed denial-of-service attacks, DNS-based blacklists

DNS (Domain Name System), Email and DNS–Common Problems

blacklists based on, DNS-based blacklists, Real-time blacklists

checking rules restrictions, client-based spam detection, Restriction Definitions, DNS restrictions

configuration of virtual domains, Hosting Multiple Domains

definition of, Email and DNS

email routing, Email Routing–Email Routing

BIND configuration file, Email Routing
MX records, Email Routing

host lookup problems, Common Problems

MX records

backup MX, Backup MX–Fast Flushing

overview of, DNS Overview

hierarchical hostnames, DNS Overview
resource records for domains, DNS Overview

receiving mail and, DNS and Receiving Mail

sending mail and, DNS and Sending Mail

Postfix configuration options, Configuration options
reverse PTR records, Reverse PTR records

DNSBL (DNS-based Blacklists), DNS-based blacklists, Real-time blacklists

documentation

with Postfix distribution, Documentation
Postfix, online, web sites, and mailing list, Preface
Unix (man pages), ManPages

Domain Name System (see DNS)

domain names

in email addresses, Local Parts of Email Addresses

fully-qualified

rejection of client requests based on, Strict syntax restrictions
strict syntax restrictions for clients, Strict syntax restrictions

hostname masquerading and, Masquerading Hostnames

for local delivery, Local Delivery

myorigin parameter, appending to email addresses with, Rewriting Addresses

for relay domains, Relay Messages

for virtual aliasing, Virtual Alias Messages

for virtual mailboxes, Virtual Mailbox Messages

domains

authoritative nameservers for, DNS Overview

fast_flush_domains parameter, Fast Flushing

hosting multiple, Hosting Multiple Domains–Configuring a Virtual Mailing List Manager

delivery to commands, Delivery to Commands–Configuring a Virtual Mailing List Manager
mailbox file ownership, Mailbox File Ownership
separate domains with system accounts, Separate Domains with System Accounts
separate domains with virtual accounts, Separate Domains with Virtual Accounts–Virtual alias catchall
separate message store, Separate Message Store
shared domains with system accounts, Shared Domains with System Accounts

mail exchangers for (MX records), DNS Overview

matching in lookup tables, Search order

parameters dealing with, Configuring Your MTA Identity

relay, Relay Messages

resource records database, DNS Overview

specifying domain for SASL user account, SASL passwords

types and parameters, listing of, DNS and Receiving Mail

DOS (denial-of-service) attacks, Security by Design, DNS-based blacklists

dotlock (locking type), The Mbox Format

double_bounce_sender parameter, Default:

DRAC (Dynamic Relay Authorization Control), Dynamic IP solutions

dynamic IP addresses, SMTP client authentication and, Dynamic IP solutions

E

echo command -n switch, Testing Your Authentication Configuration

egrep command, finding Postfix logging messages with, Logging

EHLO command (SMTP), The SMTP Protocol

requiring with strict syntax parameter, Strict Syntax Parameters

email

DNS and, Email and DNS–Common Problems

Internet, Email and the Internet–POP/IMAP and mailbox access, Email Topics–The SMTP Protocol

agents, summary listing of, Email Agents
DNS and, Email Routing
envelope addresses and message headers, Envelope Addresses and Message Headers
format of addresses, Local Parts of Email Addresses
history of, Introduction
limiting incoming, Receiving Limits
MDA (message delivery agent), Email Components
message and address format in header (RFC 2822), RFC 2822 messages
message format, Email Message Format
MTAs (mail transfer agents), Email Components
MUAs (mail user agents), Email and the Internet
POP/IMAP, mailbox access and, POP/IMAP and mailbox access
Postfix security, Modular Design, Shells and Processes, Security by Design
postmaster, The Postmaster
protocols, Major Email Protocols, SMTP and email submission
rejected or bounced messages, Reject or Bounce
RFCs (Request for Comments), RFCs
SMTP, The SMTP Protocol–The SMTP Protocol
software packages for, Email Components

empty_address_recipient parameter, Default:

encode_sasl_plain (Perl script), Testing Your Authentication Configuration

encoding

credentials in base64, Testing Your Authentication Configuration
exchange of credentials, Choosing an Authentication Mechanism
HTML in messages to avoid spam detection, Detection Difficulties

encryption, TLS, Transport Layer Security

end of email message, indicating in SMTP, The SMTP Protocol

enhanced SMTP (ESMTP), The SMTP Protocol

envelope addresses, Envelope Addresses and Message Headers

address masquerading and, Masquerading Hostnames
faking by spammers, SMTP authentication
strict formatting rules in SMTP RFC, Strict Syntax Parameters

errors

codes for, SMTP, Configuration options

email, notifications for, Error Notifications

host

lookup problems, Common Problems

mailing list, sending notifications to list owner, Mailing-List Owners, Testing Your List

messages about deferred or bounced email, Postfix Email Notifications

run time, Runtime

error_service_name parameter, Default:

ESMTP (enhanced SMTP), The SMTP Protocol

ETRN command, Fast Flushing

expand_owner_alias parameter, Mailing-List Owners

expansion of incomplete email addresses, turning off, Rewriting Addresses

Experimental Release package, Additional Information and How to Obtain Postfix

export_environment parameter, Default:

external databases, External Databases–Configuring transport_maps

using for lookup values, Other Formats

F

fallback_relay parameter, Default:

fallback_transport parameter, Postfix and Cyrus IMAP

false-positive spam identification, Spam Detection

fast flushing, Flushing Messages, Fast Flushing

fast_flush_domains parameter, Flushing Messages, Fast Flushing, Default:

fast_flush_refresh_time parameter, Default:

Fax deliveries, configuring Postfix for, UUCP, Fax, and Other Deliveries

fcnt (locking type), The Mbox Format

fifo, master.cf

file locking, The Mbox Format

file permissions, Majordomo and, Potential problems

filenames as alias targets, Alias file format

files (specified in alias files), deliveries to, Alias Deliveries

filter_destination_recipient_limit parameter, Configuration

fingerprints for client certificates, Configuring client-side certificate authentication

flexibility (of Postfix), Postfix Origins and Philosophy

flock (locking type), The Mbox Format

flush daemon, Fast Flushing

wakeup for, master.cf

flushing queued messages, Flushing Messages

fast flushing, Fast Flushing

fork_attempts parameter, Default:

forwarding email, Email Forwarding, Alias restrictions

(see also alias files; aliases)
aliases and, Alias restrictions
by local delivery agent, Local Delivery
local delivery, Local Delivery
virtual alias messages, Virtual Alias Messages

forward_expansion_filter parameter, Default:

forward_path parameter, .forward Files

frequently asked questions, Frequently Asked Questions–Frequently Asked Questions

fully qualified domain names, strict syntax restrictions based on, Strict syntax restrictions

fully qualified hostname, myhostname and mydomain

rejection of client requests based on, Strict syntax restrictions
system, Starting Postfix the First Time

G

gateways

inbound mail, Inbound Mail Gateway
outbound mail, Outbound Mail Relay
UUCP, setting up, UUCP, Fax, and Other Deliveries

generic restriction rules, Restriction Definitions, Generic restrictions

gethostname function, myhostname and mydomain

groups

deliveries to virtual mailbox files, Mailbox File Ownership
group id (GID) for process invoking Mailman, Mailman
postdrop group, General Configuration and Administration

H

hard links, chroot and, chroot

hash type (lookup table database), Database formats

hash_queue_depth parameter, Default:

header checks

comparing with patterns in lookup table, Comparing Patterns
content filtering with, Content Filtering

headers

address masquerading, Masquerading Hostnames
checking in client-based spam detection, The SMTP Conversation (Briefly)
Delivered-To:, Majordomo
fields in, RFC 2822 messages
insertion by trivial-rewrite daemon, Local Email Submission
mailing list messages, example of, Mailing-List Owners
To: address in, Envelope Addresses and Message Headers

header_address_token_limit parameter, Default:

header_checks parameter, Regular expression tables, Content-Checking

regular expressions in file, Content Checking Configuration

header_size_limit parameter, Default:

HELO command (SMTP), The SMTP Protocol

requiring with strict syntax parameter, Strict Syntax Parameters
restriction list, tracing, Tracing a Restriction List
smtpd_helo restrictions, The SMTP Conversation (Briefly)

hiding names of internal hosts, Masquerading Hostnames

hierarchical naming of hosts, DNS Overview

hold queue, Queue Management

messages marked with exclamation point (!), Listing the Queue
moving messages into, Holding Messages
moving messages out of, Holding Messages
placing message in after client access map check, Access maps
placing messages in after content checking, Content Checking Actions

home_mailbox parameter, Mailbox Delivery, Default:

host, master.cf, Transport Maps

(see also DNS; hostnames)
destination, for inet transports, Transport Maps
inet socket, master.cf
lookup problems, Common Problems
tool, DNS and Sending Mail

hosting multiple domains, Hosting Multiple Domains–Configuring a Virtual Mailing List Manager

delivery to commands, Delivery to Commands–Configuring a Virtual Mailing List Manager

automatic reply program, Delivery to Commands
configuring virtual auto-responder, Configuring a Virtual Auto-Responder–Configuring a Virtual Auto-Responder
configuring virtual mailing list manager, Configuring a Virtual Mailing List Manager

mailbox file ownership, Mailbox File Ownership

Postfix configuration for, deciding on, Hosting Multiple Domains

separate domains with system accounts, Separate Domains with System Accounts

separate domains with virtual accounts, Separate Domains with Virtual Accounts–Virtual alias catchall

catachall addresses, Catchall Addresses
mailbox file ownership, Mailbox File Ownership
virtual aliases, Virtual Aliases

separate message store, Separate Message Store

shared domains with system accounts, Shared Domains with System Accounts

hostname command (Unix), Starting Postfix the First Time

hostnames

client restrictions based on strict syntax, Strict syntax restrictions

client-based rules, restrictions for checking, Access maps

connected SMTP client, sent with HELO, The SMTP Conversation (Briefly)

for mail exchangers, in MX records, Email Routing

identifying spam from, Client-Based Spam Detection

mapping to IP addresses, Email and DNS

(see also DNS)

mapping to IP addresses to, DNS Overview

masquerading, Masquerading Hostnames

spam blocking based on during SMTP conversation, The SMTP Conversation (Briefly)

system

fully qualified, Starting Postfix the First Time
parameters dealing with, Configuring Your MTA Identity

hosts parameter, seting for MySQL, MySQL parameters

hours (h), master.cf

HTML code in message body to avoid spam detection, Detection Difficulties, Comparing Patterns

https, Postfix and TLS

I

ignore_mx_lookup_error parameter, Default:

ignoring headers or lines from body of message, Content Checking Actions

IMAP, Major Email Protocols, Major Email Protocols

(see also POP/IMAP)
Cyrus IMAP, Local Mail Transfer Protocol
POP versus, POP Versus IMAP

inbound mail gateway, Inbound Mail Gateway

include files

as alias targets, Alias file format
security risks with, Alias restrictions

incoming email, limiting, Receiving Limits

incoming queue, The Postfix Queue, Queue Management

incomplete email addresses, turning off address completion for, Rewriting Addresses

inet sockets

LMTP server using, Postfix and Cyrus IMAP

inet target, master.cf

info file, Creating a Majordomo list

initialization scripts for Unix systems, Do it yourself

initial_destination_concurrency parameter, Message Delivery, Default:

input/output

standard input and standard output, Unix, Standard Input/Standard Output

installing daemon-based content filter, Installing a content filter

installing Postfix, General Configuration and Administration, Installation–Installation

upgrading, Upgrading

Internet

email and, Email and the Internet–POP/IMAP and mailbox access

major email protocols, Major Email Protocols
MDA (message delivery agent), Email Components
MTAs (mail transfer agents), Email Components
MUAs (mail user agents), Email and the Internet
software packages for email, Email Components

Internet Engineering Task Force (IETF)

web site, RFCs

Internet Mail Application Protocol (see IMAP)

in_flow_delay parameter, Default:

IP addresses

client-based rules, restrictions for checking, Access maps
dynamic, SMTP authentication of client, Dynamic IP solutions
for mail exchangers, in MX records, Email Routing
identifying spam from, Client-Based Spam Detection, The SMTP Conversation (Briefly)
mapping hostnames to (see DNS)
PTR records associated with, Reverse PTR records
for remote users, Restricting relay access
reverse lookup of hostname for, DNS Overview

ipc_idle parameter, Default:

K

Kerberos authentication, Choosing an Authentication Mechanism

key agreement, Postfix and TLS

key/value pairs

in canonical maps lookup table, Lookup Tables
in lookup tables, format of, Lookup table format

L

labeling spam and delivering with spam tag, Anti-Spam Actions

LDAP, Other Formats, LDAP–Configuring transport_maps

compiling, LDAP
configuration, LDAP Configuration
directory, LDAP Example
example Postfix/LDAP configuration, LDAP Example
Postfix support for, checking, External Databases

left hand side (or LHS) of email addresses, Local Parts of Email Addresses

line continuation

in lookup table files, Lookup table format
in main.cf file, Line continuation

line_length_limit parameter, Comparing Patterns, Default:

link files, chroot and, chroot

listing messages in queues, Listing the Queue

lists, parameters that accept, Multiple values

lookup tables and, Lookup tables and simple lists

LMTP (Local Mail Transfer Protocol), Delivery via LMTP, Local Mail Transfer Protocol–A Postfix and Cyrus IMAP Example

Postfix and Cyrus IMAP, Postfix and Cyrus IMAP
Postfix and Cyrus IMAP example, A Postfix and Cyrus IMAP Example

lmtp delivery agent, Tracing a Message Through Postfix

lmtp_connect_timeout parameter, Default:

lmtp_data_init_timeout parameter, Default:

lmtp_lhlo_timeout parameter, Default:

lmtp_quit_timeout parameter, Default:

lmtp_tcp_port parameter, Default:

local addresses, Mail Delivery

LHS aliases, Alias file format

local delivery

.forward files, .forward Files

alias, Alias Deliveries

domain listings in mydestination parameter, Local Delivery

Local Mail Transfer Protocol (see LMTP)

mailbox, Mailbox Delivery

message store formats, Message Store Formats–Mbox Versus Maildir

maildir, The Maildir Format
mbox, The Mbox Format
mbox versus maildir, Mbox Versus Maildir

recipients, listing of, Local Delivery

local delivery agent, Local Delivery, Tracing a Message Through Postfix, Tracing a Message Through Postfix

local delivery transport, Postfix Delivery Transports

local domains, DNS and Receiving Mail

virtual mailing list, parallel version of, Configuring a Virtual Mailing List Manager

local email submission (to Postfix), Local Email Submission

local part, email addresses, Local Parts of Email Addresses

my_origin, appended to supply domain, Rewriting Addresses
searching for in lookup tables, Search order

local_destination_concurrency_limit parameter, Message Delivery, Example:

local_recipient_maps parameter, Local Delivery, Default: proxy:unix

configuring for LDAP, Configuring local_recipient_maps
configuring for MySQL/Postfix, Configuring local_recipient_maps
preventing rejection of mail for unknown users, Unknown Users
setting to query LDAP directory, LDAP Example

local_transport parameter

LMTP and Unix domain socket, using, Postfix and Cyrus IMAP
Postfix delivery of messages to Cyrus IMAP, Postfix and Cyrus IMAP

locking files, The Mbox Format

logging, Logging

mail log file, Logging
Postfix startup problems, Starting Postfix the First Time
SMTP, The SMTP Conversation (Briefly)
syslog daemon (syslogd), Logging
verbose, turning on, master.cf

LOGIN authentication mechanism, Choosing an Authentication Mechanism

login names (Unix), Login Names and UID Numbers

lookup tables, Lookup Tables–Other Formats

access maps, Access maps

aliases (see alias files)

assigning parameters to, Database formats

assigning to canonical_maps, Separate Domains with System Accounts

canonical addresses, mapping, Canonical Addresses

canonical_maps, Lookup Tables

content checking, Content-Checking

regular expressions in, Content Checking Configuration

database formats, Database formats

default directory for, General Configuration and Administration

dynamic updates of user IP addresses, Dynamic IP solutions

format of, Lookup table format

other formats, Other Formats

parameters that take lists, Lookup tables and simple lists

regular expression, Regular expression tables

relocated addresses or domains, Relocated Users

search order in, Search order

sender addresses mapped to SASL logins, Preventing sender spoofing

transport, Inbound Mail Gateway

virtual alias addresses, Virtual Alias Messages, Configuring a Virtual Auto-Responder

for virtual mailbox addresses, Virtual Mailbox Messages

luser_relay parameter, Unknown Users, Example:

M

mail, Receiving Limits

(see also email, Internet)

incoming, limiting, Receiving Limits

relaying, Mail Relaying–UUCP, Fax, and Other Deliveries

backup MX, Backup MX–Fast Flushing
client authentication for, SASL Authentication
inbound mail gateway, Inbound Mail Gateway
outbound, Outbound Mail Relay
transport maps, Transport Maps–Deferring delivery
UUCP, fax and others, UUCP, Fax, and Other Deliveries

mail delivery agents (see MDAs)

mail delivery loops

Majordomo moderator approval and, Majordomo
preventing with myhostname values, Configuring additional Postfix components

mail exchangers

A records for, Email Routing

aliases and, Email Routing

backup MX, Backup MX–Fast Flushing

fast flushing, Fast Flushing
relay recipients, Relay Recipients

DNS MX records, Email Routing, Email Routing, Email Routing

(see also MX records)

host preference values, Email Routing

hostname instead of IP address in MX record, Email Routing

Postfix server as MX host, Common Problems

preference values in MX records, Email Routing

MAIL FROM command (SMTP), The SMTP Protocol, The SMTP Conversation (Briefly)

checking address supplied by client with, Access maps
no valid DNS entry with, A simple example
reject_unknown_sender_domain rule and, DNS restrictions

mail log file, Logging

mail servers, DNS and, Email and DNS

mail transfer agents (see MTAs)

mail user agents (see MUAs)

mailbox access (see message stores POP/IMAP)

mailbox delivery, Mailbox Delivery

mailbox file ownership, Mailbox File Ownership

mailbox names, required (RFC 2142), Important aliases

mailbox_command parameter, Default:

mailbox_delivery_lock parameter, Default:

mailbox_transport parameter, Example:

Postfix, passing messages to Cyrus IMAP, Postfix and Cyrus IMAP

maildir format, The Maildir Format

configuring Postfix to use, Mailbox Delivery
mbox versus, Mbox Versus Maildir
virtual mailbox files, Separate Domains with Virtual Accounts

maildrop directory, Local Email Submission, Tracing a Message Through Postfix

mailing list for virtual domain, configuring manager for, Configuring a Virtual Mailing List Manager

Mailing List Managers (see MLMs)

mailing lists, Mailing Lists–Creating a Mailman list

additional alias files for, Additional Alias Files

creating simple, Creating a Simple Mailing List

MLMs, Mailing-List Managers

Mailman, Mailman–Creating a Mailman list
Majordomo, Majordomo–Potential problems

owners of, Mailing-List Owners

separate list files, Separate List Files

simple, creating through alias facility, Simple Mailing Lists

testing by sending message to alias, Testing Your List

Mailman, Mailman–Creating a Mailman list

configure, running with GID for mailman group, Mailman

creating a list, Creating a Mailman list

aliases, storing in separate file, Creating a Mailman list
initializing mailing list with newlist, Creating a Mailman list

group id (GID) of invoking process, Mailman

Python, requirement for, Mailman

mailman user account and group name, Mailman

mailq command, Listing the Queue

mail_owner parameter, master.cf, Default:

mail_spool_directory parameter, Mailbox Delivery, Default:

main.cf

configuration for components, overriding in master.cf, master.cf

main.cf file, Configuration Files, The main.cf Configuration File

changes in, reloading Postfix for, Multiple values

chroot, master.cf

configuration variables, Configuration variables

editing, The main.cf Configuration File

limits on incoming mail, configuring, Receiving Limits

line continuation in, Line continuation

multiple values for parameters, Multiple values

pointer to file containing, Multiple values

rules (Postfix UBE), default setting for, Listing Restrictions

strict syntax parameters, Strict Syntax Parameters

Majordomo, Majordomo–Potential problems

aliases table, Configuring a Virtual Mailing List Manager

creating a list, Creating a Majordomo list

aliases database, Creating a Majordomo list
aliases file, Creating a Majordomo list
info file message to new members, Creating a Majordomo list
obtaining and installing Majordomo, Creating a Majordomo list
Perl, verifying for, Creating a Majordomo list
potential problems with file permissions, Potential problems
subscribing to the list, Creating a Majordomo list
testing installation, Creating a Majordomo list

majordomo.cf file, Creating a Majordomo list

malicious program sending garbage commands, Receiving Limits

man pages, ManPages

with Postfix distribution, Documentation

man-in-the-middle attacks, Specifying mechanisms

manpage_directory parameter, Example:

MANPATH variable, Documentation

map types, Database formats

alias files, Locating aliases
regular expression lookup tables, Regular expression tables

masquerade_classes parameter, Masquerading Hostnames

masquerade_domains parameter, Masquerading Hostnames, Default:

preserving domain names from stripping, Masquerading Hostnames
setting to hide/show subdomains, Masquerading Hostnames

masquerade_exceptions parameter, Masquerading Hostnames

masquerading hostnames, Masquerading Hostnames

master daemon, Postfix Components, Configuration Files

master.cf file, Configuration Files, master.cf–master.cf

chrooting individual components, chroot
command (to execute a service), master.cf
filtering of messages delivered by smtpd, Configuration
maxproc, master.cf, Message Delivery
overriding configuration information in main.cf, master.cf
private, master.cf
sample file, master.cf
service name, master.cf
transport, Transport Maps
transport type, master.cf, Message Delivery
unpriv, master.cf
wakeup, master.cf

matching patterns (see regular expressions)

maximal_backoff_time parameter, Queue Scheduling, Default:

maximal_queue_lifetime parameter, Queue Scheduling, Backup MX

maxproc (master.cf), master.cf, Message Delivery

max_idle parameter, Default:

mbox format, The Mbox Format, Mailbox Delivery

virtual mailbox files, Separate Domains with Virtual Accounts

MDAs (mail delivery agents), Email Components

content filtering by, Content Filtering
defined, Email Agents
spam filtering, Anti-Spam Actions
specialized, using to set up per-user UBE rules, Comparing Patterns

message ID, Listing the Queue

message stores, Email Components

delivery to nonstandard with LMTP, Local Mail Transfer Protocol

formats, Message Store Formats–Mbox Versus Maildir

maildir, The Maildir Format, Mailbox Delivery
mbox, The Mbox Format, Mailbox Delivery
mbox versus maildir, Mbox Versus Maildir
Postfix and POP/IMAP agreement on, Postfix and POP/IMAP Servers

message retrieval with POP and IMAP, Major Email Protocols

separate, hosting virtual domains with, Separate Message Store

shell access to (on Unix), POP/IMAP and mailbox access

messages, email

content-based spam detection, Content-Based Spam Detection

delivery by Postfix, Mail Delivery–Pipe delivery

local, Local Delivery
other delivery agents, Other Delivery Agents
other messages, Other Messages
relay messages, Relay Messages
virtual alias messages, Virtual Alias Messages
virtual mailbox messages, Virtual Mailbox Messages

format for message and address in header (RFC 2822), RFC 2822 messages

format of, Email Message Format

how they enter Postfix system, How Messages Enter the Postfix System–Email Forwarding

email forwarding, Email Forwarding
email notifications, Postfix Email Notifications
local email submission, Local Email Submission
network email, Email from the Network

inspecting content for prhrases common to spam, Spam Detection

queueing by Postfix, The Postfix Queue

spam, actions Postfix can take with, Postfix Configuration, How restrictions work

tracing through Postfix, Tracing a Message Through Postfix–Tracing a Message Through Postfix

message_size_limit parameter, Receiving Limits, Default:

MIME encoding, RFC 2822 messages

converting strings to, Testing Your Authentication Configuration

mime_header_checks parameter, Content-Checking, Default:

minimal_backoff_time parameter, Queue Scheduling, Default:

minutes (m), master.cf

MLMs (Mailing List Managers), Mailing Lists, Mailing-List Managers

Mailman, Mailman–Creating a Mailman list

configure, running with mailman GID, Mailman
creating a list, Creating a Mailman list
Python, requirement for, Mailman

Majordomo, Majordomo–Potential problems

creating list, Creating a Majordomo list

mmencode command, Testing Your Authentication Configuration

modular design, Postfix, Modular Design

MTAs (mail transfer agents), Email Components

content filtering, Content Filtering
defined, Email Agents
mail exchangers, specified in MX records, DNS Overview
message headers and, Envelope Addresses and Message Headers
rejecting or bouncing messages, Reject or Bounce
routing email with DNS MX records, Email Routing
SMTP protocol, use of, SMTP and email submission

MUAs (mail user agents), Email and the Internet

content filtering by, Content Filtering
defined, Email Agents
message headers and, Envelope Addresses and Message Headers
POP/IMAP and SMTP, Major Email Protocols
POP/IMAP servers, message retrieval from, POP/IMAP and mailbox access
SMTP protocol, use of, SMTP and email submission
spam filtering, Anti-Spam Actions

mutual_auth (password mechanism), Specifying mechanisms

MX records, DNS Overview

backup MX, Backup MX–Fast Flushing
DNS checking rules, client restrictions based on, DNS restrictions
domains without, Common Problems
host preference values, Email Routing
Postfix lookups of, DNS and Sending Mail
rules for, Email Routing

mydestination parameter, Local Delivery, mydestination

destination domains handled by local transport, Local Delivery
virtual domains, adding to, Shared Domains with System Accounts

mydomain parameter, myhostname and mydomain, Default:

myhostname parameter, Starting Postfix the First Time, myhostname and mydomain

daemon-based filters and, Configuration

mynetworks parameter, Restricting relay access, Default:

configuring for daemon-based filter, Configuring additional Postfix components
outbound mail relay, Outbound Mail Relay

mynetworks_style parameter, Restricting relay access

myorigin parameter, myorigin, Rewriting Addresses, Default:

MySQL, Other Formats, MySQL

compiling, MySQL

configuration of, MySQL Configuration

MySQL parameters, MySQL parameters

example of MySQL/Postfix configuration, MySQL Example

Postfix support for, checking, External Databases

mysql-local.cf file, Configuring local_recipient_maps

N

named pipes (fifo transport type), master.cf

names

fifo transport type, master.cf
inet transport in master.cf, master.cf
unix transport type, master.cf

nameservers for domains, DNS Overview

namespaces (separate), for virtual domains, Separate Domains with System Accounts

nested_header_checks parameter, Content-Checking

network email

entering Postfix system, Email from the Network
message delivery with Postfix, The Role of Postfix

network/netmask notation, Restricting relay access

networks

deliveries between mail systems on same, Delivery via LMTP
IP addresses, lookup tables for lists of, Lookup tables and simple lists
sockets (inet transportation type), master.cf

new directory (maildir), The Maildir Format

newaliases command, Starting Postfix the First Time, Building alias database files, Additional Alias Files, Creating a Majordomo list

newaliases_path parameter, Default:

newlist command (Mailman), Creating a Mailman list

NIS, Locating aliases

noactive (password mechanism), Specifying mechanisms

noanonymous (password mechanism), Specifying mechanisms

nobody account, Alias Deliveries

nodictionary (password mechanism), Specifying mechanisms

non_fqdn_reject_code parameter, Strict syntax restrictions

noplaintext (password mechanims), Specifying mechanisms

notifications of email errors, Postfix Email Notifications, Postfix Email Notifications, Error Notifications

(see also errors)

notify_classes parameter, Error Notifications, Default:

nslookup tool, DNS and Sending Mail

nsswitch.conf file, Common Problems

O

Official Release package, Additional Information and How to Obtain Postfix

One-Time Passwords (see OTP authentication mechanism)

open relays, Relay Control, Open Relays

anonymous authentication mechanism and, Choosing an Authentication Mechanism
DNS-based blacklists of, DNS-based blacklists
preventing with Postfix UBE rules, Listing Restrictions

openssl command, Becoming a CA

generating public/private key for user, Creating client certificates
generating public/private keys for your server, Generating Server Certificates
signing your own certificate, Creating client certificates

OpenSSL libraries, TLS Certificates

openssl x509 command, Configuring client-side certificate authentication

operating systems, precompiled Postfix packages for, Additional Information and How to Obtain Postfix

other client checks (restrictions), Restriction Definitions

OTP authentication mechanism, Choosing an Authentication Mechanism

outbound mail relay, Outbound Mail Relay

outgoing messages, controlling resources for, Message Delivery

owners of mailing lists, bounce notification message to, Testing Your List

owner_request_special parameter, Mailing-List Owners

P

PAM, using as SASL authentication framework, Unix passwords

parameters, Configuration Parameters–Example:

content-checking, Content-Checking
documentation in sample files, Documentation
for domain types, DNS and Receiving Mail
LDAP, LDAP Configuration
main.cf and sample configuration files, listing in, The main.cf Configuration File
MySQL, MySQL parameters
SASL password authentication, Configuring Postfix
strict syntax, Strict Syntax Parameters
system hostname and domain, Configuring Your MTA Identity
TLS within SMTP client, Configuring TLS/SMTP Client
TLS within SMTP server, Postfix/TLS Configuration

parent_domain_matches_subdomains parameter, Search order, Default:

password parameter, setting for MySQL, MySQL parameters

passwords

authentication framework, choosing, Choosing an Authentication Framework
authentication mechanism for, specifying, Specifying mechanisms
protecting with TLS, SASL Authentication
SASL authentication for storing and verifying, SASL Overview
SASL, using as authentication framework, SASL passwords
Unix system passwords as SASL framework, Unix passwords

paths, specifying with variable expansion, .forward Files

pattern matching (see regular expressions)

pcre (Perl-compatible regular expressions), Regular expression tables

PEM format for certificates, TLS Certificates

performance, Postfix and, Postfix Origins and Philosophy

Perl

deleting queued messages by email address, script for, Deleting Messages
encode_sasl_plain.pl script, Testing Your Authentication Configuration
Majordomo approve script, Majordomo
Majordomo, requirement for, Majordomo

Perl-compatible regular expressions (pcre), Regular expression tables

permit restriction, How restrictions work, Generic restrictions

permit_auth_destination parameter, Other client-checking restrictions

permit_mynetworks parameter, A simple example, Other client-checking restrictions

permit_sasl_authenticated restriction, Configuring Postfix, Permitting authenticated users

permit_tls_clientcerts, Configuring client-side certificate authentication

persistent message storage, Email Components

PGP, Transport Layer Security

pickup daemon, Local Email Submission, Tracing a Message Through Postfix

wakeup for, master.cf

pickup_service_name parameter, Default:

pipe daemon, Configuring a Virtual Auto-Responder

delivering messages through, Pipe delivery
executing your own commands with, master.cf
pipe delivery agent, Tracing a Message Through Postfix
variable expansion of recipients list, Configuration

pipelining, reject_unauth_pipelining rule, Strict syntax restrictions

pipes, named (fifo transport), master.cf

PKCS12 format, client certificates, Creating client certificates

PLAIN mechanism (authentication), Choosing an Authentication Mechanism, Testing Your Authentication Configuration

plaintext passwords

noplaintext mechanism, Specifying mechanisms
use with saslauthd daemon, Specifying mechanisms

plug-ins, auxprop, SASL passwords

pointers to files, Multiple values

POP, Major Email Protocols

pop-before-smtp, Dynamic IP solutions

POP/IMAP, POP and IMAP

clients logging on before SMTP authentication, Dynamic IP solutions

email software packages, Email Components

handing messages to in LMTP protocol, Delivery via LMTP

local delivery and, Local Delivery and POP/IMAP

LMTP, Local Mail Transfer Protocol–A Postfix and Cyrus IMAP Example
maildir message store format, The Maildir Format
mbox message store format, The Mbox Format
message store format, choice of, Mbox Versus Maildir
nonstandard message stores, Local Mail Transfer Protocol

mailbox access and, POP/IMAP and mailbox access

passing mail for virtual domains to, Separate Message Store

POP versus IMAP, POP Versus IMAP

Postfix deliveries to virtual accounts and, Hosting Multiple Domains

Postfix, cooperation with, Postfix and POP/IMAP Servers

separate user database, sharing, Choosing an Authentication Framework

virtual mailboxes, setting up, Separate Domains with Virtual Accounts

Portable Operating System Interface (POSIX), Regular expression tables

ports

destination, for inet transport delivery, Transport Maps
inet socket, master.cf
well-known, for SMTP (port 25), The SMTP Protocol

POSIX extended regular expressions (see regexp)

Post Office Protocol (see POP POP/IMAP)

postalias command, Building alias database files, Postfix Commands

postcat command, Postfix Commands

-q option (displaying queue contents), Displaying Messages
shell script wrapper for, Displaying Messages

postconf command, Starting Postfix the First Time, Postfix Commands

-h myhostname, SASL passwords
-l (locking) option, The Mbox Format
-m (map) option, Database formats
-m option, checking for MySQL and LDAP support, External Databases

postdrop command, Local Email Submission, Postfix Commands

postdrop group, General Configuration and Administration

Postfix

compatibility with Sendmail, Postfix Origins and Philosophy
online documentation, web sites, and mailing list, Preface
role in message delivery, The Role of Postfix
web site for information and source code, Additional Information and How to Obtain Postfix

postfix command, Administration, Postfix Commands

starting, stopping, and reloading Postfix, Starting, Stopping, and Reloading Postfix

postfix user, General Configuration and Administration

postkick command, Postfix Commands

postlock command, Postfix Commands

postlog command, Postfix Commands

postmap command, Lookup table format, Postfix Commands

-q option, testing lookup tables, Other Formats
checking LDAP configuration with, Configuring local_recipient_maps
checking MySQL configuration file, Configuring local_recipient_maps
executing against clientcerts file, Configuring client-side certificate authentication
executing against virtual alias lookup table, Configuring a Virtual Auto-Responder
executing on virtual aliases file, Separate Domains with System Accounts
testing canonical file with, Canonical Addresses
testing regular expressions with, Comparing Patterns

postmaster, The Postmaster

error notices sent to, Error Notifications

postqueue command, Queue Management, Queue Tools, Postfix Commands

-f (flush) option, Flushing Messages, Deferring mail relay
-p option, listing all messages with, Listing the Queue
-s (site) option, Flushing Messages, Fast Flushing

postsuper command, Queue Management, Queue Tools, Postfix Commands

-d (delete) option, Deleting Messages
-d ALL (deleting all queued messages), Deleting Messages
-h (hold) option, Holding Messages
-H option (moving message to normal queue), Holding Messages
-r (requeue) option, Requeuing Messages

precompiled Postfix packages for operating systems, Additional Information and How to Obtain Postfix

preference values for mail exchangers, Email Routing

Postfix SMTP client, handling by, Configuration options

printf command, Testing Your Authentication Configuration

private column (master.cf), master.cf

privilege levels for processes, Modular Design

unpriv (master.cf), master.cf

processes

limit to (maxproc, in master.cf), master.cf
limiting for available transports, Message Delivery
Postfix, security and, Modular Design
pseudo account for, Pseudo-Accounts
shells and, Shells and Processes
Unix, standard input/standard output, Standard Input/Standard Output

process_id_directory parameter, Example:

protocols for email, Major Email Protocols

IMAP, Major Email Protocols

POP, Major Email Protocols

POP/IMAP, mailbox access and, POP/IMAP and mailbox access

SMTP, Major Email Protocols

email submission and, SMTP and email submission

proxy servers, abuse by spammers, DNS-based blacklists

proxy_interfaces parameter, Default:

pseudo-accounts

for daemon-based filter, Creating a pseudoaccount
for filter program, Configuration
on Unix, Pseudo-Accounts

PTR records, DNS Overview

DNS checking rules, client restrictions based on, DNS restrictions
reverse mapping to a hostname, Reverse PTR records

public-key cryptography, Postfix and TLS

client certificates, Creating client certificates
generating server certificates, Generating Server Certificates

Python, Mailman requirement for, Creating a Mailman list

Q

qmgr daemon (see queue management)

qmgr_clog_warn_time parameter, Possible values:

qmgr_message_active_limit parameter, Default:

qmgr_message_recipient_minimum parameter, Default:

qmqpd_error_delay parameter, Default:

queue ID, Listing the Queue

displaying queue contents by, Displaying Messages

queue management, Queue Management–Flushing Messages

qmgr daemon, how it works, How qmgr Works

corrupt messages, Corrupt Messages
deferred mail, Deferred Mail
error notifications, Error Notifications
message delivery, Message Delivery
queue scheduling, Queue Scheduling

tools for, Queue Tools–Flushing Messages

deleting messages, Deleting Messages
displaying messages, Displaying Messages
flushing messages, Flushing Messages
holding messages, Holding Messages
listing messages, Listing the Queue
requeuing messages, Requeuing Messages

queue manager, Local Email Submission, Local Email Submission

(see also queue management)
network email, handling, Email from the Network

queue manager, Postfix, The Postfix Queue

queue scans

scheduled intervals for, Queue Scheduling
specifying time between, Running Postfix at System Startup

queueing messages, Postfix Components

queues, General Configuration and Administration

(see also (see also queue management; entries under individual queue names])
default Postfix directory for, General Configuration and Administration
incoming, active, deferred, hold, and corrupt, Queue Management

queue_directory parameter, Queue Management, Default:

chroot location, specifying, master.cf
root directories for chrooted services, chroot

queue_minfree parameter, How qmgr Works

queue_run_delay parameter, Running Postfix at System Startup, Queue Scheduling, Default:

R

rbl_reply_maps parameter, Default:

RCPT TO command (SMTP), The SMTP Protocol, The SMTP Conversation (Briefly)

checking address client supplied with, Access maps
rejection of client after, How restrictions work

realtime blacklists, DNS-based blacklists

client restrictions based on, Real-time blacklists
restrictions based on, Restriction Definitions

Received: header, RFC 2822 messages

receiving limits, Receiving Limits

errors from a client, Receiving Limits
recipients for a single message, Receiving Limits
for any transport type, Message Delivery, Configuring a Virtual Auto-Responder

receiving mail, DNS and, DNS and Receiving Mail

receiving messages (Postfix system), Postfix Components, How Messages Enter the Postfix System–Email Forwarding

email forwarding, Email Forwarding
email notifications, Postfix Email Notifications
local email submission, Local Email Submission
network email, Email from the Network

recipient addresses, The SMTP Conversation (Briefly)

for queued messages, Listing the Queue

recipients

for error messages, Error Notifications
local delivery, listing of, Local Delivery
multiple, for a message, The Role of Postfix
relayed mail, Relay Recipients
variable expansion of list by pipe daemon, Configuration

recipient_canonical_maps parameter, Canonical Addresses, Default:

recursive lookups, Database formats

redelivery attempts for deferred messages, Deferred Mail

regexp, Regular expression tables

regular expressions

content checking parameters, lookup tables for, Content Checking Configuration
in lookup tables, Regular expression tables
lookup tables for access maps, Access maps
lookup tables for content checking, Content-Checking
Perl-compatible (pcre), Regular expression tables
POSIX extended (regexp), Regular expression tables
testing with postmap command, Comparing Patterns

reject restriction, How restrictions work, Generic restrictions

rejected messages, Reject or Bounce, How restrictions work

(see also response codes)
default time lapse before notifying client, How restrictions work
Postfix reply codes to client, The SMTP Conversation (Briefly)

rejecting messages

after content checking, Content Checking Actions

after checking access maps for clients, Access maps

spam

choosing 4xx or 5xx response codes, Generic restrictions
immediately during SMTP conversation, Anti-Spam Actions

for unknown users, Unknown Users

reject_code parameter, Default:

reject_invalid_hostname parameter, A simple example, Tracing a Restriction List, Tracing a Restriction List

reject_non_fqdn_hostname, Strict syntax restrictions

reject_non_fqdn_recipient, Strict syntax restrictions

reject_non_fqdn_sender, Strict syntax restrictions

reject_rbl_client, Real-time blacklists

reject_rhsbl_client, Real-time blacklists

reject_rhsbl_sender, Real-time blacklists

reject_sender_login_mismatch, Preventing sender spoofing

reject_unauth_destination parameter, A simple example, Other client-checking restrictions

reject_unauth_pipelining, Strict syntax restrictions

reject_unknown_client, DNS restrictions

reject_unknown_hostname, DNS restrictions

reject_unknown_recipient_domain, DNS restrictions

reject_unknown_sender_domain, A simple example, DNS restrictions

relay addresses, Mail Delivery

delivery of messages to, Relay Messages

relay control, Relay Control

client-side certificate authentication, Certificate authentication
dynamic IP solutions, Dynamic IP solutions
restricting relay access, Restricting relay access
SMTP authentication, SMTP authentication

relay delivery transport, Postfix Delivery Transports

relay domains, DNS and Receiving Mail

relayhost parameter, Outbound Mail Relay

relaying mail, Mail Relaying–UUCP, Fax, and Other Deliveries

backup MX, Backup MX–Fast Flushing

fast flushing, Fast Flushing
relay recipients list, Relay Recipients

client authentication for, SASL Authentication

inbound mail gateway, Inbound Mail Gateway

open relays, use by spammers, Open Relays

outbound, Outbound Mail Relay

relay recipients, Relay Recipients

spammer practices, The Nature of Spam

systems hijacked by spammers for, DNS-based blacklists

transport maps, Transport Maps–Deferring delivery

entries, Transport Maps
postponing mail delivery, Postponing Mail Delivery

UUCP, fax and others, UUCP, Fax, and Other Deliveries

relay_domains parameter, Relay Messages, Backup MX, Relay Recipients

configuring mail gateway to internal system, Inbound Mail Gateway

sites

flushing messages destined for, Flushing Messages

relay_domains_reject_code parameter, Default:

relay_recipient_maps parameter, Relay Recipients

lists of valid recipients for, Inbound Mail Gateway

relay_transport parameter, Default:

reliability (of Postfix), Postfix Origins and Philosophy

reloading Postfix

for main.cf changes to take effect, Multiple values
postfix reload command, using, Starting, Stopping, and Reloading Postfix

relocated users, address rewriting for, Relocated Users

relocated_maps parameter, Search order, Relocated Users, Default:

remote users

IP addresses for, Restricting relay access
SASL authentication of, SASL Authentication

reply codes (see response codes)

repository for suspected spam, Anti-Spam Actions

Request for Comments (see RFCs)

requeuing messages, Requeuing Messages

resolv.conf file, Common Problems

resolve_dequoted_address parameter, Default:

resource errors, Error Notifications

resource records, DNS Overview

command-line tools for querying, DNS and Sending Mail

response codes

hard and soft reject responses, Testing new restrictions
for messages rejected by Postfix, The SMTP Conversation (Briefly)
rejected request from unknown client, DNS restrictions
rejecting spam with 4xx or 5xx codes, Generic restrictions
request rejected for unknown hostname, DNS restrictions
requests rejected for non fully-qualified hostname, Strict syntax restrictions
requests rejected for non fully-qualified recipient address, Strict syntax restrictions
requests rejected for unknown recipient domain, DNS restrictions
requests rejected for unknown sender domain, DNS restrictions
SMTP, The SMTP Protocol, Configuration options

restriction classes, Postfix Configuration, Customized Restriction Classes

examples of, Sample Restriction Classes
exceptions to normal restrictions, Customized Restriction Classes

restrictions

assigned to client-detection rules, Client-Detection Rules

access maps, Access maps
definitions of, Restriction Definitions
DNS restrictions, DNS restrictions
example restriction, A simple example
generic restrictions, Generic restrictions
how they work, How restrictions work
listing, Listing Restrictions
other, Other client-checking restrictions
realtime blacklists, Real-time blacklists
SMTP rules and restrictions, The SMTP Conversation (Briefly), Listing Restrictions
strict syntax, Strict syntax restrictions
testing new, Testing new restrictions

permit_sasl_authenticated, Configuring Postfix

Postfix anti-spam example, Postfix Anti-Spam Example

reject_sender_login_mismatch, Preventing sender spoofing

tracing a restriction list, Tracing a Restriction List

retrieving mail from message store (see POP/IMAP)

reverse lookup of IP addresses to hostnames, DNS Overview

reverse PTR mapping to a hostname, Reverse PTR records

RFC 2142 (required mailbox names), Important aliases

RFC 2554, “SMTP Service Extension for Authentication”, SASL Authentication

RFC 2821 (SMTP protocol), The SMTP Protocol

RFC 2822 (email headers, message and address format), RFC 2822 messages

RFC 3207, SMTP extension known as STARTTLS, Transport Layer Security

RFC 822 (email message format), Email Message Format

RFC 882 (defining DNS service), DNS Overview

RFCs (Request for Comments), RFCs

right hand side (or RHS) of email addresses, Local Parts of Email Addresses

root account, The Superuser

# prompt, Command Prompts
aliases and owner identity, Alias file format
services requiring root privileges, master.cf
system aliases pointed to, Important aliases

routing email, Email Routing–Email Routing

DNS MX records, Email Routing

rules for, Email Routing

DNS, BIND configuration file, Email Routing

incoming mail, The Postfix Queue

MX records, DNS Overview

run time errors, Runtime

S

S/Key (see OTP authentication mechanism)

S/MIME, Transport Layer Security

sample configuration files, The main.cf Configuration File

sample_directory parameter, Documentation, Default:

SASL authentication, Dynamic IP solutions, SASL Authentication–Procedure to Enable SMTP Client Authentication

choosing authentication framework, Choosing an Authentication Framework

choosing authentication mechanism, Choosing an Authentication Mechanism

client authentication for STMP server, SASL Authentication

configuring Postfix for, Configuring Postfix for SASL–Configuration Summary

configuration summary, Configuration Summary
enabling SASL, Enabling SASL
parameters for SASL authentication, Configuring Postfix
permitting authenticated users, Permitting authenticated users
preventing sender spoofing, Preventing sender spoofing
specifying a framework, Specifying a Framework–SASL passwords
specifying password mechanisms, Specifying mechanisms

overview, SASL Overview

Postfix, using with, Postfix and SASL

requirements for, Postfix and SASL
SASLv2, Postfix and SASL
testing authentication configuration, Testing Your Authentication Configuration–Testing Your Authentication Configuration

SMTP client authentication, SMTP Client Authentication

saslauthd daemon, Unix passwords

-a option, Unix passwords

sasldb auxiliary property plug-in, SASL passwords

saslpasswd2 command, SASL passwords

saving spam into a suspected spam repository, Anti-Spam Actions

search order, lookup tables, Search order

seconds (s), master.cf

security, Postfix Origins and Philosophy, Postfix Security–Security by Design

chroot environment for services, chroot
design factors preventing attacks, Security by Design
include files and, Alias restrictions
modular Postfix architecture, Modular Design
shells and processes, Shells and Processes
Simple Authentication and Security Layer (see SASL)
Transport Layer Security (see TLS)

select_field parameter, MySQL parameters, Configuring local_recipient_maps, Configuring alias_maps

sender

of message in queue, Listing the Queue

sender addresses

indicated in MAIL FROM command (see MAIL FROM command)
spoofing, prevention of, Preventing sender spoofing

sender_canonical_maps parameter, Canonical Addresses

sending mail, DNS and, DNS and Sending Mail

Postfix configuration options, Configuration options
reverse PTR records, Reverse PTR records

Sendmail, Introduction

-q option, specifying time between queue scans, Running Postfix at System Startup
alias files, format compatible with, Alias Files
Postfix compatibility with, Postfix Origins and Philosophy
security problems as privileged process, Modular Design

sendmail command, Local Email Submission, Tracing a Message Through Postfix, Running Postfix at System Startup, Command-Based Filtering

sendmail_path parameter, Default:

separate domains, Hosting Multiple Domains

with system accounts, Separate Domains with System Accounts
with virtual accounts, Separate Domains with Virtual Accounts

service name (master.cf file), master.cf

session key (TLS), Postfix and TLS

setgid_group parameter, Default:

shared domains, Hosting Multiple Domains

shell script (wrapper for postcat command), Displaying Messages

shells, processes and, Shells and Processes

showq_service_name parameter, Default:

signed certificate, Postfix and TLS

acting as your own CA, Generating Server Certificates
converting to users’ email client format, Creating client certificates
server, Postfix/TLS Configuration

Simple Authentication and Security Layer (see SASL authentication)

Simple Mail Transport Protocol (see SMTP)

sites

blacklisted (see blacklisted sites)
eligible for fast flushing, Fast Flushing
flushing messages destined for, Flushing Messages

size

limiting for incoming messages, Receiving Limits
of messages in queue, Listing the Queue

SMTP, Introduction, Major Email Protocols

client authentication, SMTP Client Authentication

enabling, Procedure to Enable SMTP Client Authentication

client authentication with SASL protocol, SASL Authentication

client-based rules and restrictions, listing of, Listing Restrictions

client-based spam detection during transaction, Client-Detection Rules

conversation, with client-detection rules, The SMTP Conversation (Briefly)

deferring all deliveries, Deferring delivery

email software packages, Email Components

email submission, SMTP and email submission

enhancements for, The SMTP Protocol

envelope addresses, specifying, Envelope Addresses and Message Headers

ETRN command, Fast Flushing

logging of conversation, The SMTP Conversation (Briefly)

mail delivery outside of system, Tracing a Message Through Postfix

overview of, The SMTP Protocol–The SMTP Protocol

Postfix/TLS configuration, Postfix/TLS Configuration

receipt/delivery of messages by Postfix, The Role of Postfix

rejecting spam immediately during conversation, Anti-Spam Actions

response codes for Postfix requests, Configuration options

response codes, listed with definitions, The SMTP Protocol

SASL authentication for telnet client, Testing Your Authentication Configuration–Testing Your Authentication Configuration

STARTTLS extension, Transport Layer Security

strict syntax

checking restrictions, client-based rules, Restriction Definitions
parameters, Strict Syntax Parameters

TLS client, configuring, Configuring TLS/SMTP Client

SMTP authentication, SMTP authentication

for clients with dynamic IP addresses, Dynamic IP solutions

smtp client service, creating specialized, master.cf

smtp delivery agent, Relay Messages, Other Messages

smtp transport, Postfix Delivery Transports

smtpd daemon, Email from the Network, Tracing a Message Through Postfix

limits on incoming mail, enforcement of, Receiving Limits

smtpd.conf file, Specifying a Framework

saslauthd, Postfix use for authentication, Unix passwords

smtpd_banner parameter, Default:

smtpd_client_restrictions

daemon-based filters and, Configuring additional Postfix components

smtpd_client_restrictions parameter, Client-Detection Rules

smtpd_data_restrictions parameters, Client-Detection Rules, Default:

smtpd_delay_reject parameter, How restrictions work

smtpd_error_sleep_time parameter, Receiving Limits, Default:

smtpd_expansion_filter parameter, Default:

smtpd_hard_error_limit parameter, Receiving Limits

smtpd_helo_required parameter, Strict Syntax Parameters, Default:

smtpd_helo_restrictions, Client-Detection Rules, The SMTP Conversation (Briefly), Tracing a Restriction List

daemon-based filters and, Configuring additional Postfix components

smtpd_history_flush_threshold parameter, Default:

smtpd_noop_commands parameter, Default:

smtpd_recipient_limit parameter, Default:

smtpd_recipient_restrictions parameter, Client-Detection Rules, A simple example, Permitting authenticated users

adding permit_tls_clientcerts to restriction rules, Configuring client-side certificate authentication
setting for daemon-based filter, Configuring additional Postfix components

smtpd_restriction_classes parameter, Default:

smtpd_sasl_auth_enable parameter, Configuring Postfix, Testing Your Authentication Configuration

smtpd_sasl_security_options parameter, Specifying mechanisms

smtpd_sender_login_maps parameter, Preventing sender spoofing

smtpd_sender_restrictions, Client-Detection Rules, Tracing a Restriction List

daemon-based filters and, Configuring additional Postfix components

smtpd_soft_error_limit parameter, Receiving Limits, Default:

smtpd_tls_ask_ccert parameter, Configuring client-side certificate authentication

smtpd_tls_CAfile parameter, Postfix/TLS Configuration

smtpd_tls_CApath parameter, Postfix/TLS Configuration

smtpd_tls_cert_file parameter, Postfix/TLS Configuration

smtpd_tls_key_file parameter, Postfix/TLS Configuration

smtpd_use_tls parameter, Postfix/TLS Configuration

smtp_bind_address parameter, Default:

smtp_connect_timeout parameter, master.cf

smtp_data_done_timeout parameter, Default:

smtp_data_xfer_timeout parameter, Default:

smtp_destination_concurrency_limit parameter, Message Delivery

smtp_helo_timeout parameter, Default:

smtp_mail_timeout parameter, Default:

smtp_pix_workaround_delay_time parameter, Default:

smtp_quit_timeout parameter, Default:

smtp_randomize_addresses parameter, Configuration options

smtp_rcpt_timeout parameter, Default:

smtp_sasl_auth_enable parameter, Procedure to Enable SMTP Client Authentication

smtp_sasl_password_maps parameter, SMTP Client Authentication, Procedure to Enable SMTP Client Authentication

smtp_sasl_security_options parameter, SMTP Client Authentication

smtp_skip_5xx_greeting parameter, Default:

smtp_tls_CAfile parameter, Configuring TLS/SMTP Client

smtp_tls_cert_file parameter, Configuring TLS/SMTP Client

smtp_tls_key_file parameter, Configuring TLS/SMTP Client

smtp_use_tls parameter, Configuring TLS/SMTP Client

sockets

LMTP server, Separate Message Store
SMTP client connections to Postfix, The SMTP Conversation (Briefly)
Unix-domain or TCP, for LMTP deliveries, Postfix and Cyrus IMAP

socket_type parameter, Postfix and Cyrus IMAP

software errors, Error Notifications

software packages for Internet email, Email Components

soft_bounce parameter, Default:

testing new restrictions, Testing new restrictions

spam, Blocking Unsolicited Bulk Email–Postfix Anti-Spam Example

anti-spam actions, Anti-Spam Actions

blocking with relay control, Relay Control

configuring Postfix to check, Postfix Configuration–Postfix Anti-Spam Example

categories of spam detection, Postfix Configuration
client-detection rules, Client-Detection Rules–Tracing a Restriction List
content checking, Content-Checking–Comparing Patterns
customized restriction classes, Customized Restriction Classes
strict syntax parameters, Strict Syntax Parameters

detection of, Spam Detection–Detection Difficulties

client-based, Client-Based Spam Detection
content-based, Content-Based Spam Detection
misidentifying legitimate messages as spam, Spam Detection
primary methods for, Spam Detection
spammer tactics to circumvent, Detection Difficulties

dishonest components to, The Nature of Spam

incomplete addresses, use of, Rewriting Addresses

luser_relay parameter and, Unknown Users

open realys, Open Relays

Postfix anti-spam example, Postfix Anti-Spam Example

problems caused by, The Problem of Spam

restriction list, tracing, Tracing a Restriction List

special characters, quoting in alias definitions, Alias file format

spoofing sender addresses, preventing, Preventing sender spoofing

SQL statement created by Postfix, MySQL parameters

SSL (Secure Sockets Layer) (see TLS)

standard error (stderr), Standard Input/Standard Output

standard input (stdin), Standard Input/Standard Output

standard output (stdout), Standard Input/Standard Output

standards adherence, filtering spam by (see strict syntax checking)

starting Postfix with postfix start command, Starting, Stopping, and Reloading Postfix

starting Postfix, first time, Starting Postfix the First Time

aliases file, system, Starting Postfix the First Time
hostname for system, Starting Postfix the First Time

STARTTLS command, Postfix and TLS

status codes, SMTP server replies, Configuration options

stopping Postfix (postfix stop command), Starting, Stopping, and Reloading Postfix

storage of email messages, Email Components

strace, chroot

strict syntax

parameters for, Strict Syntax Parameters

strict syntax checking

client restrictions based on, Restriction Definitions, Strict syntax restrictions
parameters for, Postfix Configuration

strict_7bit_headers parameter, Default:

strict_8bitmime_body parameter, Default:

strict_rfc821_envelopes parameter, Strict Syntax Parameters, Default:

strong authentication, Transport Layer Security

subdomains, masquerade domain names and, Masquerading Hostnames

subnets, specifying with network/netmask notation, Restricting relay access

subscribing to Majordomo list, Creating a Majordomo list

superuser (see root account)

swap_bangpath parameter, Default:

symbolic names for ports, master.cf

symlinks

chroot and, chroot
for initialization script, Do it yourself

syntax, strict adherence to standards (see strict syntax checking)

syslog daemon, Logging

syslog_name parameter, Default:

system accounts, Hosting Multiple Domains

separate virtual domains with, Separate Domains with System Accounts
shared domains with, Shared Domains with System Accounts

system aliases, Important aliases

system log files, Logging

system startup

running Postfix at, Running Postfix at System Startup–Do it yourself

writing an initialization script, Do it yourself

starting saslauthd automatically at, Unix passwords

T

table parameter (MySQL), MySQL parameters

targets for aliases, Alias file format

restricting in alias files, Alias restrictions

TCP sockets, listening for LMTP deliveries, Postfix and Cyrus IMAP

telnet, testing SASL authentication with, Testing Your Authentication Configuration–Testing Your Authentication Configuration

text editors, editing main.cf file, The main.cf Configuration File

time limits on deferred mail redelivery attempts, Queue Scheduling

time units, master.cf

TLS (Transport Layer Security), Certificate authentication, SASL Authentication, Transport Layer Security–Configuring TLS/SMTP Client

certificates, TLS Certificates

becoming a CA, Becoming a CA
client-side, Requiring Client-Side Certificates–Configuring client-side certificate authentication
generating server certificates, Generating Server Certificates
installing CA certificates, Installing CA Certificates
public-key cryptography, use of, Postfix and TLS

compiling, TLS

configuring TLS-SMTP client, Configuring TLS/SMTP Client

Postfix and, Postfix and TLS

Postfix/TLS configuration, Postfix/TLS Configuration

summary of, Postfix/TLS Configuration Summary

tmp directory (maildir), The Maildir Format

To: address in email message headers, Envelope Addresses and Message Headers

tracing message through Postfix, Tracing a Message Through Postfix–Tracing a Message Through Postfix

tracing service failures in chroot environment, chroot

Transport Layer Security (see TLS)

transport maps, Transport Maps–Deferring delivery

entries, Transport Maps

host, Transport Maps
port, Transport Maps
right hand side values, formats for, Transport Maps
transport, Transport Maps

postponing mail delivery, Postponing Mail Delivery

deferring delivery, Deferring delivery
deferring mail relay, Deferring mail relay

transport table, listing of delivery agents, Other Delivery Agents

transport types

inet, unix, and fifo, master.cf
master.cf file entry for, Transport Maps
valid service names for, master.cf

transports

message delivery, configuration for, Message Delivery
Postfix delivery, Postfix Delivery Transports

transport_destination_recipient_limit parameter, Message Delivery, Configuring a Virtual Auto-Responder

transport_maps parameter, Configuring a Virtual Auto-Responder

configuring for LDAP, Configuring transport_maps
lookup table, search order in, Search order
pointing to transport lookup table, Inbound Mail Gateway

transport_retry_time parameter, Default:

trivial-rewrite daemon, Local Email Submission, Tracing a Message Through Postfix

routing information, determining for queue manager, The Postfix Queue

truss, chroot

tusc, chroot

U

UBE (Unsolicited Bulk Email) (see spam)

UIDs (user ids), Unix, Login Names and UID Numbers

undeliverable messages, information about, The Postfix Queue

undisclosed_recipients_header parameter, Default:

Unix, Unix Topics

command prompts, Command Prompts
hostname command, Starting Postfix the First Time
initialization scripts for, Do it yourself
login names and UIDs, Login Names and UID Numbers
long lines, continuation with backslashes, Long Lines
man pages, ManPages
Postfix and, Audience
pseudo accounts, Pseudo-Accounts
shell access to message store, POP/IMAP and mailbox access
shell process, Postfix and, Shells and Processes
standard input/standard output, Standard Input/Standard Output
superuser (root) account, The Superuser
system passwords as SASL authentication framework, Unix passwords

unix (transportation type), master.cf

Unix-domain sockets, listening for LMTP deliveries, Postfix and Cyrus IMAP

unknown_address_reject_code parameter, DNS restrictions, DNS restrictions

unknown_client_reject_code parameter, DNS restrictions, Default:

unknown_hostname_reject_code parameter, DNS restrictions

unknown_local_recipient_reject_code parameter, Default:

unknown_virtual_alias_reject_code parameter, Default:

Unsolicited Bulk Email (UBE) (see spam)

upgrading Postfix, Upgrading

user accounts

SASL, creating for SMTP server, SASL passwords

separate domains with virtual accounts

mailbox file ownership, Mailbox File Ownership

system

separate virtual domains with, Separate Domains with System Accounts
shared domains with, Shared Domains with System Accounts

system and virtual, Hosting Multiple Domains

virtual, separate domains with, Separate Domains with Virtual Accounts–Virtual alias catchall

user parameter, setting for MySQL, MySQL parameters

users

.forward files, checking by local delivery agent, Local Delivery
NIS database of, Locating aliases
passwords (see passwords)
postfix user, General Configuration and Administration
relocated, address rewriting for, Relocated Users
spam, labeling for, Anti-Spam Actions
unknown, Unknown Users

UUCP, setting up gateway for, UUCP, Fax, and Other Deliveries

uuencoding, RFC 2822 messages

V

variable expansion, Configuration

variables

configuration, Configuration variables
specifying path with variable expansion, .forward Files

Venema, Wietse, Postfix Origins and Philosophy

verbose logging information, master.cf

verp_delimiter_filter parameter, Default:

Vexira AntiVirus for mail servers, Daemon-Based Filter Example

virtual accounts, Hosting Multiple Domains

separate domains with, Separate Domains with Virtual Accounts–Virtual alias catchall
separate password database for SMTP users, Choosing an Authentication Framework

virtual alias addresses, Mail Delivery, Virtual Alias Messages

virtual aliases, DNS and Receiving Mail

catchall addresses with, Virtual alias catchall

virtual delivery agent, Virtual Mailbox Messages, Separate Domains with Virtual Accounts

virtual delivery transport, Postfix Delivery Transports

virtual domains, DNS and Receiving Mail, Hosting Multiple Domains

DNS configuration, Hosting Multiple Domains
MySQL configuration, Configuring virtual domains
Postfix handling of mail for, Hosting Multiple Domains

virtual mailbox addresses, Mail Delivery

virtual mailbox catchall address, Virtual mailbox catchall

virtual mailbox domains, virtual delivery transport for, Postfix Delivery Transports

virtual mailboxes, DNS and Receiving Mail

virtual mailing list manager, configuring, Configuring a Virtual Mailing List Manager

virtual_alias_domains parameter, Virtual Alias Messages, Separate Domains with System Accounts, Virtual Aliases

virtual_alias_maps parameter, Virtual Alias Messages, Search order, Separate Domains with System Accounts, Virtual Aliases, Configuring a Virtual Auto-Responder, Default:

virtual_gid_maps parameter, Mailbox File Ownership

virtual_mailbox_base parameter, Separate Domains with Virtual Accounts, Separate Domains with Virtual Accounts, Default:

virtual_mailbox_domains parameter, Virtual Mailbox Messages, Separate Domains with Virtual Accounts, Virtual Aliases

listing virtual domains for mail acceptance, Separate Message Store

virtual_mailbox_limit parameter, Default:

virtual_mailbox_maps parameter, Virtual Mailbox Messages, Separate Domains with Virtual Accounts, Default:

pointing to lookup file with valid addresses, Separate Message Store

virtual_transport parameter, Separate Message Store, Default:

virtual_uid_maps parameter, Mailbox File Ownership

viruses

anti-virus filters, Content Filtering, Content Filtering
scanning for with header checks, Comparing Patterns
Vexira AntiVirus program, Daemon-Based Filter Example

W

wakeup (master.cf), master.cf
warning message after content checking, Content Checking Actions
warn_if_reject parameter, Testing new restrictions
web site, Postfix online documentation, Documentation
weeks (w), master.cf
well-known ports (port 25 for SMTP servers), The SMTP Protocol
where_field parameter (MySQL), MySQL parameters, Configuring local_recipient_maps
whitelist applications (pre-approval for sending mail), Spam Detection
WHOSON, Dynamic IP solutions

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D. Frequently Asked Questions

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About the Author

Table of Contents for Postfix: The Definitive Guide

Index

A note on the digital index

Symbols

A

B

C

D

E

F

G

H

I

K

L

M

N

O

P

Q

R

S

T

U

V

W

Table of Contents for
Postfix: The Definitive Guide