From: Michael Orlitzky (michaelorlitzky.com)
Date: Sat May 01 2010 - 19:51:27 CDT

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 From http://www.postfix.org/postconf.5.html#canonical_maps,

   Note: with Postfix version 2.2, message header address mapping
   happens only when message header address rewriting is enabled:

   * The message is received with the Postfix sendmail(1) command,
   * The message is received from a network client that matches
     $local_header_rewrite_clients,
   * The message is received from the network, and the
     remote_header_rewrite_domain parameter specifies a non-empty value.

It is not immediately clear whether these conditions are and/or. A
possible clarification would be to add "Header address rewriting is
enabled when any of the following are true:" prior to the list.

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