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+#++
+# NAME
+# virtual 5
+# SUMMARY
+# Postfix virtual alias table format
+# SYNOPSIS
+# \fBpostmap /etc/postfix/virtual\fR
+#
+# \fBpostmap -q "\fIstring\fB" /etc/postfix/virtual\fR
+#
+# \fBpostmap -q - /etc/postfix/virtual <\fIinputfile\fR
+# DESCRIPTION
+# The optional \fBvirtual\fR(5) alias table rewrites recipient
+# addresses for all local, all virtual, and all remote mail
+# destinations.
+# This is unlike the \fBaliases\fR(5) table which is used
+# only for \fBlocal\fR(8) delivery. Virtual aliasing is
+# recursive, and is implemented by the Postfix \fBcleanup\fR(8)
+# daemon before mail is queued.
+#
+# The main applications of virtual aliasing are:
+# .IP \(bu
+# To redirect mail for one address to one or more addresses.
+# .IP \(bu
+# To implement virtual alias domains where all addresses are aliased
+# to addresses in other domains.
+# .sp
+# Virtual alias domains are not to be confused with the virtual mailbox
+# domains that are implemented with the Postfix \fBvirtual\fR(8) mail
+# delivery agent. With virtual mailbox domains, each recipient address
+# can have its own mailbox.
+# .PP
+# Virtual aliasing is applied only to recipient
+# envelope addresses, and does not affect message headers.
+# Use \fBcanonical\fR(5)
+# mapping to rewrite header and envelope addresses in general.
+#
+# Normally, the \fBvirtual\fR(5) alias table is specified as a text file
+# that serves as input to the \fBpostmap\fR(1) command.
+# The result, an indexed file in \fBdbm\fR or \fBdb\fR format,
+# is used for fast searching by the mail system. Execute the command
+# "\fBpostmap /etc/postfix/virtual\fR" 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 regular-expression
+# map where patterns are given as regular expressions, or lookups
+# can be directed to TCP-based server. In those case, the lookups
+# are done in a slightly different way as described below under
+# "REGULAR EXPRESSION TABLES" or "TCP-BASED TABLES".
+# CASE FOLDING
+# .ad
+# .fi
+# 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
+# .ad
+# .fi
+# The input format for the \fBpostmap\fR(1) command is as follows:
+# .IP "\fIpattern address, address, ...\fR"
+# When \fIpattern\fR matches a mail address, replace it by the
+# corresponding \fIaddress\fR.
+# .IP "blank lines and comments"
+# Empty lines and whitespace-only lines are ignored, as
+# are lines whose first non-whitespace character is a `#'.
+# .IP "multi-line text"
+# A logical line starts with non-whitespace text. A line that
+# starts with whitespace continues a logical line.
+# TABLE SEARCH ORDER
+# .ad
+# .fi
+# With lookups from indexed files such as DB or DBM, or from networked
+# tables such as NIS, LDAP or SQL, each \fIuser\fR@\fIdomain\fR
+# query produces a sequence of query patterns as described below.
+#
+# Each query pattern is sent to each specified lookup table
+# before trying the next query pattern, until a match is
+# found.
+# .IP "\fIuser\fR@\fIdomain address, address, ...\fR"
+# Redirect mail for \fIuser\fR@\fIdomain\fR to \fIaddress\fR.
+# This form has the highest precedence.
+# .IP "\fIuser address, address, ...\fR"
+# Redirect mail for \fIuser\fR@\fIsite\fR to \fIaddress\fR when
+# \fIsite\fR is equal to $\fBmyorigin\fR, when \fIsite\fR is listed in
+# $\fBmydestination\fR, or when it is listed in $\fBinet_interfaces\fR
+# or $\fBproxy_interfaces\fR.
+# .sp
+# This functionality overlaps with functionality of the local
+# \fIaliases\fR(5) database. The difference is that \fBvirtual\fR(5)
+# mapping can be applied to non-local addresses.
+# .IP "@\fIdomain address, address, ...\fR"
+# Redirect mail for other users in \fIdomain\fR to \fIaddress\fR.
+# This form has the lowest precedence.
+# .sp
+# Note: @\fIdomain\fR is a wild-card. With this form, the
+# Postfix SMTP server accepts
+# mail for any recipient in \fIdomain\fR, regardless of whether
+# that recipient exists. This may turn your mail system into
+# a backscatter source: Postfix first accepts mail for
+# non-existent recipients and then tries to return that mail
+# as "undeliverable" to the often forged sender address.
+# .sp
+# To avoid backscatter with mail for a wild-card domain,
+# replace the wild-card mapping with explicit 1:1 mappings,
+# or add a reject_unverified_recipient restriction for that
+# domain:
+#
+# .nf
+# smtpd_recipient_restrictions =
+# ...
+# reject_unauth_destination
+# check_recipient_access
+# inline:{example.com=reject_unverified_recipient}
+# unverified_recipient_reject_code = 550
+#.fi
+#
+# In the above example, Postfix may contact a remote server
+# if the recipient is aliased to a remote address.
+# RESULT ADDRESS REWRITING
+# .ad
+# .fi
+# The lookup result is subject to address rewriting:
+# .IP \(bu
+# When the result has the form @\fIotherdomain\fR, the
+# result becomes the same \fIuser\fR in \fIotherdomain\fR.
+# This works only for the first address in a multi-address
+# lookup result.
+# .IP \(bu
+# When "\fBappend_at_myorigin=yes\fR", append "\fB@$myorigin\fR"
+# to addresses without "@domain".
+# .IP \(bu
+# When "\fBappend_dot_mydomain=yes\fR", append
+# "\fB.$mydomain\fR" to addresses without ".domain".
+# ADDRESS EXTENSION
+# .fi
+# .ad
+# When a mail address localpart contains the optional recipient delimiter
+# (e.g., \fIuser+foo\fR@\fIdomain\fR), the lookup order becomes:
+# \fIuser+foo\fR@\fIdomain\fR, \fIuser\fR@\fIdomain\fR, \fIuser+foo\fR,
+# \fIuser\fR, and @\fIdomain\fR.
+#
+# The \fBpropagate_unmatched_extensions\fR parameter controls whether
+# an unmatched address extension (\fI+foo\fR) is propagated to the
+# result of table lookup.
+# VIRTUAL ALIAS DOMAINS
+# .ad
+# .fi
+# Besides virtual aliases, the virtual alias table can also be used
+# to implement virtual alias domains. With a virtual alias domain, all
+# recipient addresses are aliased to addresses in other domains.
+#
+# Virtual alias domains are not to be confused with the virtual mailbox
+# domains that are implemented with the Postfix \fBvirtual\fR(8) mail
+# delivery agent. With virtual mailbox domains, each recipient address
+# can have its own mailbox.
+#
+# With a virtual alias domain, the virtual domain has its
+# own user name space. Local (i.e. non-virtual) usernames are not
+# visible in a virtual alias domain. In particular, local
+# \fBaliases\fR(5) and local mailing lists are not visible as
+# \fIlocalname@virtual-alias.domain\fR.
+#
+# Support for a virtual alias domain looks like:
+#
+# .nf
+# /etc/postfix/main.cf:
+# virtual_alias_maps = hash:/etc/postfix/virtual
+# .fi
+#
+# Note: some systems use \fBdbm\fR databases instead of \fBhash\fR.
+# See the output from "\fBpostconf -m\fR" for available database types.
+#
+# .nf
+# /etc/postfix/virtual:
+# \fIvirtual-alias.domain anything\fR (right-hand content does not matter)
+# \fIpostmaster@virtual-alias.domain postmaster\fR
+# \fIuser1@virtual-alias.domain address1\fR
+# \fIuser2@virtual-alias.domain address2, address3\fR
+# .fi
+# .sp
+# The \fIvirtual-alias.domain anything\fR entry is required for a
+# virtual alias domain. \fBWithout this entry, mail is rejected
+# with "relay access denied", or bounces with
+# "mail loops back to myself".\fR
+#
+# Do not specify virtual alias domain names in the \fBmain.cf
+# mydestination\fR or \fBrelay_domains\fR configuration parameters.
+#
+# With a virtual alias domain, the Postfix SMTP server
+# accepts mail for \fIknown-user@virtual-alias.domain\fR, and rejects
+# mail for \fIunknown-user\fR@\fIvirtual-alias.domain\fR as undeliverable.
+#
+# Instead of specifying the virtual alias domain name via
+# the \fBvirtual_alias_maps\fR table, you may also specify it via
+# the \fBmain.cf virtual_alias_domains\fR configuration parameter.
+# This latter parameter uses the same syntax as the \fBmain.cf
+# mydestination\fR configuration parameter.
+# REGULAR EXPRESSION TABLES
+# .ad
+# .fi
+# 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 \fBregexp_table\fR(5)
+# or \fBpcre_table\fR(5).
+#
+# Each pattern is a regular expression that is applied to the entire
+# address being looked up. Thus, \fIuser@domain\fR mail addresses are not
+# broken up into their \fIuser\fR and \fI@domain\fR constituent parts,
+# nor is \fIuser+foo\fR broken up into \fIuser\fR and \fIfoo\fR.
+#
+# Patterns are applied in the order as specified in the table, until a
+# pattern is found that matches the search string.
+#
+# Results are the same as with indexed file lookups, with
+# the additional feature that parenthesized substrings from the
+# pattern can be interpolated as \fB$1\fR, \fB$2\fR and so on.
+# TCP-BASED TABLES
+# .ad
+# .fi
+# This section describes how the table lookups change when lookups
+# are directed to a TCP-based server. For a description of the TCP
+# client/server lookup protocol, see \fBtcp_table\fR(5).
+# This feature is not available up to and including Postfix version 2.4.
+#
+# Each lookup operation uses the entire address once. Thus,
+# \fIuser@domain\fR mail addresses are not broken up into their
+# \fIuser\fR and \fI@domain\fR constituent parts, nor is
+# \fIuser+foo\fR broken up into \fIuser\fR and \fIfoo\fR.
+#
+# Results are the same as with indexed file lookups.
+# BUGS
+# The table format does not understand quoting conventions.
+# CONFIGURATION PARAMETERS
+# .ad
+# .fi
+# The following \fBmain.cf\fR parameters are especially relevant to
+# this topic. See the Postfix \fBmain.cf\fR file for syntax details
+# and for default values. Use the "\fBpostfix reload\fR" command after
+# a configuration change.
+# .IP "\fBvirtual_alias_maps ($virtual_maps)\fR"
+# Optional lookup tables that alias specific mail addresses or domains
+# to other local or remote address.
+# .IP "\fBvirtual_alias_domains ($virtual_alias_maps)\fR"
+# Postfix is final destination for the specified list of virtual
+# alias domains, that is, domains for which all addresses are aliased
+# to addresses in other local or remote domains.
+# .IP "\fBpropagate_unmatched_extensions (canonical, virtual)\fR"
+# What address lookup tables copy an address extension from the lookup
+# key to the lookup result.
+# .PP
+# Other parameters of interest:
+# .IP "\fBinet_interfaces (all)\fR"
+# The network interface addresses that this mail system receives
+# mail on.
+# .IP "\fBmydestination ($myhostname, localhost.$mydomain, localhost)\fR"
+# The list of domains that are delivered via the $local_transport
+# mail delivery transport.
+# .IP "\fBmyorigin ($myhostname)\fR"
+# The domain name that locally-posted mail appears to come
+# from, and that locally posted mail is delivered to.
+# .IP "\fBowner_request_special (yes)\fR"
+# Enable special treatment for owner-\fIlistname\fR entries in the
+# \fBaliases\fR(5) file, and don't split owner-\fIlistname\fR and
+# \fIlistname\fR-request address localparts when the recipient_delimiter
+# is set to "-".
+# .IP "\fBproxy_interfaces (empty)\fR"
+# The network interface addresses that this mail system receives mail
+# on by way of a proxy or network address translation unit.
+# SEE ALSO
+# cleanup(8), canonicalize and enqueue mail
+# postmap(1), Postfix lookup table manager
+# postconf(5), configuration parameters
+# canonical(5), canonical address mapping
+# README FILES
+# .ad
+# .fi
+# Use "\fBpostconf readme_directory\fR" or
+# "\fBpostconf html_directory\fR" to locate this information.
+# .na
+# .nf
+# ADDRESS_REWRITING_README, address rewriting guide
+# DATABASE_README, Postfix lookup table overview
+# VIRTUAL_README, domain hosting guide
+# LICENSE
+# .ad
+# .fi
+# 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
+#--