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# VIRTUAL(5)                                                          VIRTUAL(5)

#

# NAME

#        virtual - Postfix virtual alias table format

#

# SYNOPSIS

#        postmap /etc/postfix/virtual

#

#        postmap -q "string" /etc/postfix/virtual

#

#        postmap -q - /etc/postfix/virtual <inputfile

#

# DESCRIPTION

#        The  optional  virtual(5)  alias  table rewrites recipient

#        addresses for all local, all virtual, and all remote  mail

#        destinations.   This  is unlike the aliases(5) table which

#        is used only for local(8) delivery.  Virtual  aliasing  is

#        recursive,  and  is  implemented by the Postfix cleanup(8)

#        daemon before mail is queued.

#

#        The main applications of virtual aliasing are:

#

#        o      To redirect mail for one address  to  one  or  more

#               addresses.

#

#        o      To   implement  virtual  alias  domains  where  all

#               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  virtual(8) mail delivery agent.

#               With  virtual  mailbox  domains,   each   recipient

#               address can have its own mailbox.

#

#        Virtual  aliasing  is  applied  only to recipient envelope

#        addresses, and  does  not  affect  message  headers.   Use

#        canonical(5)   mapping  to  rewrite  header  and  envelope

#        addresses in general.

#

#        Normally, the virtual(5) alias 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/virtual" 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 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

#        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 address, address, ...

#               When pattern matches a mail address, replace it  by

#               the corresponding address.

#

#        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.

#

# TABLE SEARCH ORDER

#        With lookups from indexed files such as DB or DBM, or from

#        networked  tables  such  as  NIS,  LDAP   or   SQL,   each

#        user@domain 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.

#

#        user@domain address, address, ...

#               Redirect mail for  user@domain  to  address.   This

#               form has the highest precedence.

#

#        user address, address, ...

#               Redirect mail for user@site to address when site is

#               equal to $myorigin, when site is listed in  $mydes-

#               tination,  or when it is listed in $inet_interfaces

#               or $proxy_interfaces.

#

#               This functionality overlaps with  functionality  of

#               the  local  aliases(5)  database. The difference is

#               that virtual(5) mapping can be applied to non-local

#               addresses.

#

#        @domain address, address, ...

#               Redirect mail for other users in domain to address.

#               This form has the lowest precedence.

#

#               Note: @domain is a wild-card. With this  form,  the

#               Postfix  SMTP server accepts mail for any recipient

#               in domain, 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.

#

# RESULT ADDRESS REWRITING

#        The lookup result is subject to address rewriting:

#

#        o      When  the  result  has  the  form @otherdomain, the

#               result becomes the same user in otherdomain.   This

#               works only for the first address in a multi-address

#               lookup result.

#

#        o      When "append_at_myorigin=yes", append  "@$myorigin"

#               to addresses without "@domain".

#

#        o      When "append_dot_mydomain=yes", append ".$mydomain"

#               to addresses without ".domain".

#

# 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, user+foo, user, and

#        @domain.

#

#        The   propagate_unmatched_extensions   parameter  controls

#        whether an unmatched address extension  (+foo)  is  propa-

#        gated to the result of table lookup.

#

# VIRTUAL ALIAS DOMAINS

#        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 vir-

#        tual mailbox domains that are implemented with the Postfix

#        virtual(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  aliases(5)  and local mailing lists are not visible

#        as localname@virtual-alias.domain.

#

#        Support for a virtual alias domain looks like:

#

#        /etc/postfix/main.cf:

#            virtual_alias_maps = hash:/etc/postfix/virtual

#

#        Note: some systems use dbm databases instead of hash.  See

#        the  output  from  "postconf  -m"  for  available database

#        types.

#

#        /etc/postfix/virtual:

#            virtual-alias.domain    anything (right-hand content does not matter)

#            postmaster@virtual-alias.domain postmaster

#            user1@virtual-alias.domain      address1

#            user2@virtual-alias.domain      address2, address3

#

#        The virtual-alias.domain anything entry is required for  a

#        virtual alias domain. Without this entry, mail is rejected

#        with "relay access denied", or bounces  with  "mail  loops

#        back to myself".

#

#        Do  not  specify virtual alias domain names in the main.cf

#        mydestination or relay_domains configuration parameters.

#

#        With a virtual  alias  domain,  the  Postfix  SMTP  server

#        accepts   mail  for  known-user@virtual-alias.domain,  and

#        rejects  mail  for  unknown-user@virtual-alias.domain   as

#        undeliverable.

#

#        Instead  of  specifying  the virtual alias domain name via

#        the virtual_alias_maps table, you may also specify it  via

#        the main.cf virtual_alias_domains configuration parameter.

#        This latter parameter uses the same syntax as the  main.cf

#        mydestination configuration parameter.

#

# 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 address being looked up. Thus, 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.

#

#        Results 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 address once.  Thus,

#        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.

#

#        Results are the same as with indexed file lookups.

#

# BUGS

#        The  table format does not understand quoting conventions.

#

# CONFIGURATION PARAMETERS

#        The following main.cf parameters are  especially  relevant

#        to  this  topic.  See  the Postfix main.cf file for syntax

#        details and for default values. Use the  "postfix  reload"

#        command after a configuration change.

#

#        virtual_alias_maps

#               List of virtual aliasing tables.

#

#        virtual_alias_domains

#               List  of  virtual alias domains. This uses the same

#               syntax as the mydestination parameter.

#

#        propagate_unmatched_extensions

#               A list of address rewriting  or  forwarding  mecha-

#               nisms  that propagate an address extension from the

#               original address to the result.   Specify  zero  or

#               more   of   canonical,   virtual,  alias,  forward,

#               include, or generic.

#

#        Other parameters of interest:

#

#        inet_interfaces

#               The network interface addresses  that  this  system

#               receives mail on.  You need to stop and start Post-

#               fix when this parameter changes.

#

#        mydestination

#               List of domains that  this  mail  system  considers

#               local.

#

#        myorigin

#               The  domain  that  is  appended to any address that

#               does not have a domain.

#

#        owner_request_special

#               Give special treatment to owner-xxx and xxx-request

#               addresses.

#

#        proxy_interfaces

#               Other interfaces that this machine receives mail on

#               by way of a proxy agent or network address transla-

#               tor.

#

# 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

#        Use  "postconf  readme_directory" or "postconf html_direc-

#        tory" to locate this information.

#        ADDRESS_REWRITING_README, address rewriting guide

#        DATABASE_README, Postfix lookup table overview

#        VIRTUAL_README, domain hosting guide

#

# 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

#

#                                                                     VIRTUAL(5)