Postfix generic configuration example for CentOS Linux 7

Get the default configuration file generic for Postfix, optimized for CentOS Linux 7. 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/generic.

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

    # GENERIC(5)                                                          GENERIC(5)
# 
# NAME
#        generic - Postfix generic table format
# 
# SYNOPSIS
#        postmap /etc/postfix/generic
# 
#        postmap -q "string" /etc/postfix/generic
# 
#        postmap -q - /etc/postfix/generic <inputfile
# 
# DESCRIPTION
#        The optional generic(5) table specifies an address mapping
#        that applies when mail is delivered. This is the  opposite
#        of  canonical(5)  mapping,  which  applies  when  mail  is
#        received.
# 
#        Typically, one would use the generic(5) table on a  system
#        that  does  not have a valid Internet domain name and that
#        uses  something  like  localdomain.local   instead.    The
#        generic(5)  table  is  then  used by the smtp(8) client to
#        transform local mail addresses into  valid  Internet  mail
#        addresses  when  mail  has to be sent across the Internet.
#        See the EXAMPLE section at the end of this document.
# 
#        The  generic(5)  mapping  affects  both   message   header
#        addresses (i.e. addresses that appear inside messages) and
#        message envelope addresses  (for  example,  the  addresses
#        that are used in SMTP protocol commands).
# 
#        Normally, the generic(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/generic" 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 expres-
#        sions, 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 result
#               When  pattern matches a mail address, replace it by
#               the corresponding result.
# 
#        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
#               Replace user@domain by address. This form  has  the
#               highest precedence.
# 
#        user address
#               Replace  user@site by address when site is equal to
#               $myorigin, when site is listed  in  $mydestination,
#               or   when  it  is  listed  in  $inet_interfaces  or
#               $proxy_interfaces.
# 
#        @domain address
#               Replace other addresses in domain by address.  This
#               form has the lowest precedence.
# 
# RESULT ADDRESS REWRITING
#        The lookup result is subject to address rewriting:
# 
#        o      When  the  result  has  the  form @otherdomain, the
#               result becomes the same user in otherdomain.
# 
#        o      When "append_at_myorigin=yes", append  "@$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.
# 
# 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.
# 
# EXAMPLE
#        The  following  shows  a  generic  mapping with an indexed
#        file.  When mail is sent to a remote host via  SMTP,  this
#        replaces  his@localdomain.local  by  his ISP mail address,
#        replaces her@localdomain.local by her  ISP  mail  address,
#        and  replaces  other  local  addresses by his ISP account,
#        with an address extension of +local (this example  assumes
#        that the ISP supports "+" style address extensions).
# 
#        /etc/postfix/main.cf:
#            smtp_generic_maps = hash:/etc/postfix/generic
# 
#        /etc/postfix/generic:
#            his@localdomain.local   hisaccount@hisisp.example
#            her@localdomain.local   heraccount@herisp.example
#            @localdomain.local      hisaccount+local@hisisp.example
# 
#        Execute  the  command "postmap /etc/postfix/generic" when-
#        ever the table is changed.  Instead of hash, some  systems
#        use  dbm database files. To find out what tables your sys-
#        tem supports use the command "postconf -m".
# 
# BUGS
#        The table format does not understand quoting  conventions.
# 
# CONFIGURATION PARAMETERS
#        The  following main.cf parameters are especially relevant.
#        The text below provides  only  a  parameter  summary.  See
#        postconf(5) for more details including examples.
# 
#        smtp_generic_maps
#               Address  mapping  lookup  table  for  envelope  and
#               header sender and recipient addresses while  deliv-
#               ering mail via SMTP.
# 
#        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.
# 
#        proxy_interfaces
#               Other interfaces that this machine receives mail on
#               by way of a proxy agent or network address transla-
#               tor.
# 
#        mydestination
#               List  of  domains  that  this mail system considers
#               local.
# 
#        myorigin
#               The domain that is appended to locally-posted mail.
# 
#        owner_request_special
#               Give special treatment to owner-xxx and xxx-request
#               addresses.
# 
# SEE ALSO
#        postmap(1), Postfix lookup table manager
#        postconf(5), configuration parameters
#        smtp(8), Postfix SMTP client
# 
# 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
#        STANDARD_CONFIGURATION_README, configuration examples
# 
# LICENSE
#        The  Secure  Mailer  license must be distributed with this
#        software.
# 
# HISTORY
#        A genericstable feature appears in the Sendmail MTA.
# 
#        This feature is available in Postfix 2.2 and later.
# 
# AUTHOR(S)
#        Wietse Venema
#        IBM T.J. Watson Research
#        P.O. Box 704
#        Yorktown Heights, NY 10598, USA
# 
#                                                                     GENERIC(5)

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