ALIASES(5)                                             ALIASES(5)

       aliases - format of the Postfix alias database

       postalias [-c config_dir] [-v] [file_type:]input_file

       The aliases file provides a system-wide mechanism to redi-
       rect mail for local recipients.

       The file serves as input to the postalias(1) command.  The
       result,  an  indexed file in dbm or db format, is used for
       fast lookup by the mail system. After  an  update  it  may
       take  a  minute  or  so before the change becomes visible.
       Issue a postfix reload command to eliminate the delay.

       The input and output file formats are expected to be  com-
       patible  with  Sendmail  version 8, and are expected to be
       suitable for the use as NIS maps.

       Users can control delivery of their own mail by setting up
       .forward files in their home directory.  Lines in per-user
       .forward files have the same syntax as the right-hand side
       of aliases entries.

       The format of the alias database input file is as follows:

       o      An alias definition has the form

                   name: value1, value2, ...

       o      Lines that begin with whitespace continue the  pre-
              vious line.

       o      Blank  lines  are  ignored,  as are lines beginning
              with `#'.

       The name is a local address (no domain part).  Use  double
       quotes  when the name contains any special characters such
       as whitespace, `#', `:', or `@'. The  name  is  folded  to
       lowercase, in order to make database lookups case insensi-

       In addition, when an alias exists for owner-name, delivery
       diagnostics  are  directed  to that address, instead of to
       the originator.  This is typically used to direct delivery
       errors  to the owner of a mailing list, who is in a better
       position to deal with mailing list delivery problems  than
       the originator of the undelivered mail.

       The value contains one or more of the following:

              Mail  is  forwarded to address, which is compatible


ALIASES(5)                                             ALIASES(5)

              with the RFC 822 standard.

              Mail is appended to /file/name.  See  local(8)  for
              details  of delivery to file.  Delivery is not lim-
              ited to regular files.  For example, to dispose  of
              unwanted mail, deflect it to /dev/null.

              Mail  is  piped into command. Commands that contain
              special characters, such as whitespace,  should  be
              enclosed  between  double  quotes. See local(8) for
              details of delivery to command.

              When the command fails, a limited amount of command
              output  is  mailed  back  to  the sender.  The file
              /usr/include/sysexits.h defines the  expected  exit
              status  codes. For example, use |"exit 67" to simu-
              late a "user  unknown"  error,  and  |"exit  0"  to
              implement an expensive black hole.

              Mail  is  sent  to  the  destinations listed in the
              named file.  Lines in :include: files have the same
              syntax as the right-hand side of alias entries.

              A  destination  can  be  any  destination  that  is
              described in this manual page. However, delivery to
              "|command" and /file/name is disallowed by default.
              To  enable,  edit  the  allow_mail_to_commands  and
              allow_mail_to_files configuration parameters.

       When alias database search fails, and the recipient local-
       part contains  the  optional  recipient  delimiter  (e.g.,
       user+foo),  the  search  is  repeated  for  the unextended
       address (e.g., user).

       The following parameters are  especially  relevant
       to  this  topic.  See  the Postfix file for syntax
       details and for default values.  Use  the  postfix  reload
       command after a configuration change.

              List of alias databases.

              Restrict  the  usage  of  mail delivery to external

              Restrict the usage of  mail  delivery  to  external


ALIASES(5)                                             ALIASES(5)

              Give special treatment to owner-xxx and xxx-request

              Delimiter that separates  recipients  from  address

       RFC 822 (ARPA Internet Text Messages)

       local(8) local delivery agent
       postalias(1) alias database management

       The  Secure  Mailer  license must be distributed with this

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA