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ALIASES(5)									       ALIASES(5)

       aliases - format of the Postfix alias database


       The  aliases table provides a system-wide mechanism to redirect mail for local recipients.
       The redirections are processed by the Postfix local(8) delivery agent.

       Normally, the aliases table is specified as a text  file  that  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. Execute the command newaliases in order to rebuild the  indexed
       file after changing the Postfix alias database.

       The  input  and output file formats are expected to be compatible 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      Empty lines and whitespace-only lines are ignored, as are lines  whose  first  non-
	      whitespace character is a `#'.

       o      A  logical line starts with non-whitespace text. A line that starts with whitespace
	      continues a logical line.

       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 lower-
       case, in order to make database lookups case insensitive.

       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 with the RFC 822 standard.

	      Mail  is	appended  to  /file/name.  See	local(8) for details of delivery to file.
	      Delivery is not limited 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 simulate 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. How-
	      ever, 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 localpart contains the optional recip-
       ient delimiter (e.g., user+foo), the search is repeated for the unextended address  (e.g.,

       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.

	      List of alias databases.

	      Restrict the usage of mail delivery to external command.

	      Restrict the usage of mail delivery to external file.

	      When  delivering	to  an alias that has an owner- companion alias, set the envelope
	      sender address to the right-hand side of the owner  alias,  instead  using  of  the
	      left-hand side address.

	      Give special treatment to owner-xxx and xxx-request addresses.

	      Delimiter that separates recipients from address extensions.

       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 software.

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

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