FYI:

On 11/13/2009 12:22 PM, Martin Gregorie wrote:

However, the docs don't say whether its checking the envelope sender
and/or the From: header.


man 5 access:

DESCRIPTION
       This  document  describes access control on remote SMTP client
       information: host names, network addresses, and envelope sender
       or  recipient addresses;                        ^^^^^^^^
       ...
       it  is  implemented  by  the  Postfix  SMTP  server.   See
       header_checks(5) or body_checks(5) for access control on the
       content of email messages.
--

     Mike

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