Postfix virtual configuration example for CentOS Linux 8

Get the default configuration file virtual for Postfix, optimized for CentOS Linux 8. This example configuration ensures optimal compatibility and performance for Postfix, making it easy to set up and adjust to meet your needs.

Find and download the configuration file here: /etc/postfix/virtual.

For more configurations and setup guides, visit our related files section to further customize your system.

    # 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)

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