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REGEXP_TABLE(5)                                   REGEXP_TABLE(5)


NAME
       regexp_table - format of Postfix regular expression tables

SYNOPSIS
       regexp:/etc/postfix/filename

DESCRIPTION
       The Postfix mail system uses optional tables  for  address
       rewriting or mail routing. These tables are usually in dbm
       or db format. Alternatively, lookup tables can  be  speci-
       fied in POSIX regular expression form.

       To  find out what types of lookup tables your Postfix sys-
       tem supports use the postconf -m command.

       The general form of a Postfix regular expression table is:

       blanks and comments
              Blank  lines  are  ignored,  as are lines beginning
              with `#'.

       pattern result
              When pattern matches a search string, use the  cor-
              responding  result.  A  line that starts with white
              space continues the preceding line.

       pattern1!pattern2 result
              Matches pattern1 but not pattern2.

       Each pattern is a regular expression enclosed by a pair of
       delimiters.  The regular expression syntax is described in
       re_format(7).  The expression delimiter can be any charac-
       ter,  except  whitespace  or  characters that have special
       meaning (traditionally the forward  slash  is  used).  The
       regular expression can contain whitespace.

       By default, matching is case-insensitive, although follow-
       ing the second slash with an `i' flag will  reverse  this.
       Other  flags are `x' (disable extended expression syntax),
       and `m' (enable multi-line mode).

       Each pattern is applied to the entire string being  looked
       up.   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, and 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
       table,  until  a  pattern is found that matches the search
       string.

       Substitution of sub-strings from the matched expression is



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REGEXP_TABLE(5)                                   REGEXP_TABLE(5)


       possible using $1, $2, etc.. The macros in the replacement
       string may need to be written as  ${n}  or  $(n)  if  they
       aren't followed by whitespace.

EXAMPLES
       # Disallow sender-specified routing. This is a must if you relay mail
       # for other domains.
       /[%!@].*[%!@]/            550 Sender-specified routing rejected

       # Postmaster is OK, that way they can talk to us about how to fix
       # their problem.
       /^postmaster@.*$/         OK

       # Protect your outgoing majordomo exploders
       /^(.*)-outgoing@(.*)$/!/^owner-.*/      550 Use ${1}@${2} instead

SEE ALSO
       pcre_table(5) format of PCRE tables

AUTHOR(S)
       The regexp table lookup code was originally written by:
       LaMont Jones
       lamont@hp.com

       That code was based on the PCRE dictionary contributed by:
       Andrew McNamara
       andrewm@connect.com.au
       connect.com.au Pty. Ltd.
       Level 3, 213 Miller St
       North Sydney, NSW, Australia

       Adopted and adapted by:
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA





















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