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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
> * 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
You go from the first to the last, first match wins.
> possible clarification would be to add "Header address rewriting is
> enabled when any of the following are true:" prior to the list.