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+# ACCESS(5) ACCESS(5)
+#
+# NAME
+# access - Postfix SMTP server access table
+#
+# SYNOPSIS
+# postmap /etc/postfix/access
+#
+# postmap -q "string" /etc/postfix/access
+#
+# postmap -q - /etc/postfix/access <inputfile
+#
+# DESCRIPTION
+# This document describes access control on remote SMTP
+# client information: host names, network addresses, and
+# envelope sender or recipient addresses; it is implemented
+# by the Postfix SMTP server. See header_checks(5) or
+# body_checks(5) for access control on the content of email
+# messages.
+#
+# Normally, the access(5) table is specified as a text file
+# that serves as input to the postmap(1) command. The
+# result, an indexed file in dbm or db format, is used for
+# fast searching by the mail system. Execute the command
+# "postmap /etc/postfix/access" to rebuild an indexed file
+# after changing the corresponding text file.
+#
+# When the table is provided via other means such as NIS,
+# LDAP or SQL, the same lookups are done as for ordinary
+# indexed files.
+#
+# Alternatively, the table can be provided as a regu-
+# lar-expression map where patterns are given as regular
+# expressions, or lookups can be directed to a TCP-based
+# server. In those cases, the lookups are done in a slightly
+# different way as described below under "REGULAR EXPRESSION
+# TABLES" or "TCP-BASED TABLES".
+#
+# CASE FOLDING
+# The search string is folded to lowercase before database
+# lookup. As of Postfix 2.3, the search string is not case
+# folded with database types such as regexp: or pcre: whose
+# lookup fields can match both upper and lower case.
+#
+# TABLE FORMAT
+# The input format for the postmap(1) command is as follows:
+#
+# pattern action
+# When pattern matches a mail address, domain or host
+# address, perform the corresponding action.
+#
+# blank lines and comments
+# Empty lines and whitespace-only lines are ignored,
+# as are lines whose first non-whitespace character
+# is a `#'.
+#
+# multi-line text
+# A logical line starts with non-whitespace text. A
+# line that starts with whitespace continues a logi-
+# cal line.
+#
+# EMAIL ADDRESS PATTERNS
+# With lookups from indexed files such as DB or DBM, or from
+# networked tables such as NIS, LDAP or SQL, patterns are
+# tried in the order as listed below:
+#
+# user@domain
+# Matches the specified mail address.
+#
+# domain.tld
+# Matches domain.tld as the domain part of an email
+# address.
+#
+# The pattern domain.tld also matches subdomains, but
+# only when the string smtpd_access_maps is listed in
+# the Postfix parent_domain_matches_subdomains con-
+# figuration setting.
+#
+# .domain.tld
+# Matches subdomains of domain.tld, but only when the
+# string smtpd_access_maps is not listed in the Post-
+# fix parent_domain_matches_subdomains configuration
+# setting.
+#
+# user@ Matches all mail addresses with the specified user
+# part.
+#
+# Note: lookup of the null sender address is not possible
+# with some types of lookup table. By default, Postfix uses
+# <> as the lookup key for such addresses. The value is
+# specified with the smtpd_null_access_lookup_key parameter
+# in the Postfix main.cf file.
+#
+# EMAIL ADDRESS EXTENSION
+# When a mail address localpart contains the optional recip-
+# ient delimiter (e.g., user+foo@domain), the lookup order
+# becomes: user+foo@domain, user@domain, domain, user+foo@,
+# and user@.
+#
+# HOST NAME/ADDRESS PATTERNS
+# With lookups from indexed files such as DB or DBM, or from
+# networked tables such as NIS, LDAP or SQL, the following
+# lookup patterns are examined in the order as listed:
+#
+# domain.tld
+# Matches domain.tld.
+#
+# The pattern domain.tld also matches subdomains, but
+# only when the string smtpd_access_maps is listed in
+# the Postfix parent_domain_matches_subdomains con-
+# figuration setting.
+#
+# .domain.tld
+# Matches subdomains of domain.tld, but only when the
+# string smtpd_access_maps is not listed in the Post-
+# fix parent_domain_matches_subdomains configuration
+# setting.
+#
+# net.work.addr.ess
+#
+# net.work.addr
+#
+# net.work
+#
+# net Matches a remote IPv4 host address or network
+# address range. Specify one to four decimal octets
+# separated by ".". Do not specify "[]" , "/", lead-
+# ing zeros, or hexadecimal forms.
+#
+# Network ranges are matched by repeatedly truncating
+# the last ".octet" from a remote IPv4 host address
+# string, until a match is found in the access table,
+# or until further truncation is not possible.
+#
+# NOTE: use the cidr lookup table type to specify
+# network/netmask patterns. See cidr_table(5) for
+# details.
+#
+# net:work:addr:ess
+#
+# net:work:addr
+#
+# net:work
+#
+# net Matches a remote IPv6 host address or network
+# address range. Specify three to eight hexadecimal
+# octet pairs separated by ":", using the compressed
+# form "::" for a sequence of zero-valued octet
+# pairs. Do not specify "[]", "/", leading zeros, or
+# non-compressed forms.
+#
+# A network range is matched by repeatedly truncating
+# the last ":octetpair" from the compressed-form
+# remote IPv6 host address string, until a match is
+# found in the access table, or until further trunca-
+# tion is not possible.
+#
+# NOTE: use the cidr lookup table type to specify
+# network/netmask patterns. See cidr_table(5) for
+# details.
+#
+# IPv6 support is available in Postfix 2.2 and later.
+#
+# ACCEPT ACTIONS
+# OK Accept the address etc. that matches the pattern.
+#
+# all-numerical
+# An all-numerical result is treated as OK. This for-
+# mat is generated by address-based relay authoriza-
+# tion schemes such as pop-before-smtp.
+#
+# For other accept actions, see "OTHER ACTIONS" below.
+#
+# REJECT ACTIONS
+# Postfix version 2.3 and later support enhanced status
+# codes as defined in RFC 3463. When no code is specified
+# at the beginning of the text below, Postfix inserts a
+# default enhanced status code of "5.7.1" in the case of
+# reject actions, and "4.7.1" in the case of defer actions.
+# See "ENHANCED STATUS CODES" below.
+#
+# 4NN text
+#
+# 5NN text
+# Reject the address etc. that matches the pattern,
+# and respond with the numerical three-digit code and
+# text. 4NN means "try again later", while 5NN means
+# "do not try again".
+#
+# The following responses have special meaning for
+# the Postfix SMTP server:
+#
+# 421 text (Postfix 2.3 and later)
+#
+# 521 text (Postfix 2.6 and later)
+# After responding with the numerical
+# three-digit code and text, disconnect imme-
+# diately from the SMTP client. This frees up
+# SMTP server resources so that they can be
+# made available to another SMTP client.
+#
+# Note: The "521" response should be used only
+# with botnets and other malware where inter-
+# operability is of no concern. The "send 521
+# and disconnect" behavior is NOT defined in
+# the SMTP standard.
+#
+# REJECT optional text...
+# Reject the address etc. that matches the pattern.
+# Reply with "$access_map_reject_code optional
+# text..." when the optional text is specified, oth-
+# erwise reply with a generic error response message.
+#
+# DEFER optional text...
+# Reject the address etc. that matches the pattern.
+# Reply with "$access_map_defer_code optional
+# text..." when the optional text is specified, oth-
+# erwise reply with a generic error response message.
+#
+# This feature is available in Postfix 2.6 and later.
+#
+# DEFER_IF_REJECT optional text...
+# Defer the request if some later restriction would
+# result in a REJECT action. Reply with
+# "$access_map_defer_code 4.7.1 optional text..."
+# when the optional text is specified, otherwise
+# reply with a generic error response message.
+#
+# Prior to Postfix 2.6, the SMTP reply code is 450.
+#
+# This feature is available in Postfix 2.1 and later.
+#
+# DEFER_IF_PERMIT optional text...
+# Defer the request if some later restriction would
+# result in an explicit or implicit PERMIT action.
+# Reply with "$access_map_defer_code 4.7.1 optional
+# text..." when the optional text is specified, oth-
+# erwise reply with a generic error response message.
+#
+# Prior to Postfix 2.6, the SMTP reply code is 450.
+#
+# This feature is available in Postfix 2.1 and later.
+#
+# For other reject actions, see "OTHER ACTIONS" below.
+#
+# OTHER ACTIONS
+# restriction...
+# Apply the named UCE restriction(s) (permit, reject,
+# reject_unauth_destination, and so on).
+#
+# BCC user@domain
+# Send one copy of the message to the specified
+# recipient.
+#
+# If multiple BCC actions are specified within the
+# same SMTP MAIL transaction, with Postfix 3.0 only
+# the last action will be used.
+#
+# This feature is available in Postfix 3.0 and later.
+#
+# DISCARD optional text...
+# Claim successful delivery and silently discard the
+# message. Log the optional text if specified, oth-
+# erwise log a generic message.
+#
+# Note: this action currently affects all recipients
+# of the message. To discard only one recipient
+# without discarding the entire message, use the
+# transport(5) table to direct mail to the discard(8)
+# service.
+#
+# This feature is available in Postfix 2.0 and later.
+#
+# DUNNO Pretend that the lookup key was not found. This
+# prevents Postfix from trying substrings of the
+# lookup key (such as a subdomain name, or a network
+# address subnetwork).
+#
+# This feature is available in Postfix 2.0 and later.
+#
+# FILTER transport:destination
+# After the message is queued, send the entire mes-
+# sage through the specified external content filter.
+# The transport name specifies the first field of a
+# mail delivery agent definition in master.cf; the
+# syntax of the next-hop destination is described in
+# the manual page of the corresponding delivery
+# agent. More information about external content
+# filters is in the Postfix FILTER_README file.
+#
+# Note 1: do not use $number regular expression sub-
+# stitutions for transport or destination unless you
+# know that the information has a trusted origin.
+#
+# Note 2: this action overrides the main.cf con-
+# tent_filter setting, and affects all recipients of
+# the message. In the case that multiple FILTER
+# actions fire, only the last one is executed.
+#
+# Note 3: the purpose of the FILTER command is to
+# override message routing. To override the recipi-
+# ent's transport but not the next-hop destination,
+# specify an empty filter destination (Postfix 2.7
+# and later), or specify a transport:destination that
+# delivers through a different Postfix instance
+# (Postfix 2.6 and earlier). Other options are using
+# the recipient-dependent transport_maps or the sen-
+# der-dependent sender_dependent_default_transport-
+# _maps features.
+#
+# This feature is available in Postfix 2.0 and later.
+#
+# HOLD optional text...
+# Place the message on the hold queue, where it will
+# sit until someone either deletes it or releases it
+# for delivery. Log the optional text if specified,
+# otherwise log a generic message.
+#
+# Mail that is placed on hold can be examined with
+# the postcat(1) command, and can be destroyed or
+# released with the postsuper(1) command.
+#
+# Note: use "postsuper -r" to release mail that was
+# kept on hold for a significant fraction of $maxi-
+# mal_queue_lifetime or $bounce_queue_lifetime, or
+# longer. Use "postsuper -H" only for mail that will
+# not expire within a few delivery attempts.
+#
+# Note: this action currently affects all recipients
+# of the message.
+#
+# This feature is available in Postfix 2.0 and later.
+#
+# PREPEND headername: headervalue
+# Prepend the specified message header to the mes-
+# sage. When more than one PREPEND action executes,
+# the first prepended header appears before the sec-
+# ond etc. prepended header.
+#
+# Note: this action must execute before the message
+# content is received; it cannot execute in the con-
+# text of smtpd_end_of_data_restrictions.
+#
+# This feature is available in Postfix 2.1 and later.
+#
+# REDIRECT user@domain
+# After the message is queued, send the message to
+# the specified address instead of the intended
+# recipient(s). When multiple REDIRECT actions fire,
+# only the last one takes effect.
+#
+# Note: this action overrides the FILTER action, and
+# currently overrides all recipients of the message.
+#
+# This feature is available in Postfix 2.1 and later.
+#
+# INFO optional text...
+# Log an informational record with the optional text,
+# together with client information and if available,
+# with helo, sender, recipient and protocol informa-
+# tion.
+#
+# This feature is available in Postfix 3.0 and later.
+#
+# WARN optional text...
+# Log a warning with the optional text, together with
+# client information and if available, with helo,
+# sender, recipient and protocol information.
+#
+# This feature is available in Postfix 2.1 and later.
+#
+# ENHANCED STATUS CODES
+# Postfix version 2.3 and later support enhanced status
+# codes as defined in RFC 3463. When an enhanced status
+# code is specified in an access table, it is subject to
+# modification. The following transformations are needed
+# when the same access table is used for client, helo,
+# sender, or recipient access restrictions; they happen
+# regardless of whether Postfix replies to a MAIL FROM, RCPT
+# TO or other SMTP command.
+#
+# o When a sender address matches a REJECT action, the
+# Postfix SMTP server will transform a recipient DSN
+# status (e.g., 4.1.1-4.1.6) into the corresponding
+# sender DSN status, and vice versa.
+#
+# o When non-address information matches a REJECT
+# action (such as the HELO command argument or the
+# client hostname/address), the Postfix SMTP server
+# will transform a sender or recipient DSN status
+# into a generic non-address DSN status (e.g.,
+# 4.0.0).
+#
+# REGULAR EXPRESSION TABLES
+# This section describes how the table lookups change when
+# the table is given in the form of regular expressions. For
+# a description of regular expression lookup table syntax,
+# see regexp_table(5) or pcre_table(5).
+#
+# Each pattern is a regular expression that is applied to
+# the entire string being looked up. Depending on the appli-
+# cation, that string is an entire client hostname, an
+# entire client IP address, or an entire mail address. Thus,
+# no parent domain or parent network search is done,
+# user@domain mail addresses are not broken up into their
+# user@ and domain constituent parts, nor is user+foo broken
+# up into user and foo.
+#
+# Patterns are applied in the order as specified in the ta-
+# ble, until a pattern is found that matches the search
+# string.
+#
+# Actions are the same as with indexed file lookups, with
+# the additional feature that parenthesized substrings from
+# the pattern can be interpolated as $1, $2 and so on.
+#
+# TCP-BASED TABLES
+# This section describes how the table lookups change when
+# lookups are directed to a TCP-based server. For a descrip-
+# tion of the TCP client/server lookup protocol, see tcp_ta-
+# ble(5). This feature is not available up to and including
+# Postfix version 2.4.
+#
+# Each lookup operation uses the entire query string once.
+# Depending on the application, that string is an entire
+# client hostname, an entire client IP address, or an entire
+# mail address. Thus, no parent domain or parent network
+# search is done, user@domain mail addresses are not broken
+# up into their user@ and domain constituent parts, nor is
+# user+foo broken up into user and foo.
+#
+# Actions are the same as with indexed file lookups.
+#
+# EXAMPLE
+# The following example uses an indexed file, so that the
+# order of table entries does not matter. The example per-
+# mits access by the client at address 1.2.3.4 but rejects
+# all other clients in 1.2.3.0/24. Instead of hash lookup
+# tables, some systems use dbm. Use the command "postconf
+# -m" to find out what lookup tables Postfix supports on
+# your system.
+#
+# /etc/postfix/main.cf:
+# smtpd_client_restrictions =
+# check_client_access hash:/etc/postfix/access
+#
+# /etc/postfix/access:
+# 1.2.3 REJECT
+# 1.2.3.4 OK
+#
+# Execute the command "postmap /etc/postfix/access" after
+# editing the file.
+#
+# BUGS
+# The table format does not understand quoting conventions.
+#
+# SEE ALSO
+# postmap(1), Postfix lookup table manager
+# smtpd(8), SMTP server
+# postconf(5), configuration parameters
+# transport(5), transport:nexthop syntax
+#
+# README FILES
+# Use "postconf readme_directory" or "postconf html_direc-
+# tory" to locate this information.
+# SMTPD_ACCESS_README, built-in SMTP server access control
+# DATABASE_README, Postfix lookup table overview
+#
+# LICENSE
+# The Secure Mailer license must be distributed with this
+# software.
+#
+# AUTHOR(S)
+# Wietse Venema
+# IBM T.J. Watson Research
+# P.O. Box 704
+# Yorktown Heights, NY 10598, USA
+#
+# Wietse Venema
+# Google, Inc.
+# 111 8th Avenue
+# New York, NY 10011, USA
+#
+# ACCESS(5)