From: Daniel L. Miller (dmilleramfes.com)
Date: Mon Apr 09 2007 - 00:31:53 CDT

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Currently, my spam checkers are enabled via:

smtpd_recipient_restrictions =
    check_recipient_access hash:/etc/postfix/maps/recipient_access,
    permit_sasl_authenticated,
    reject_unauth_destination,
    permit

and recipient_access:
amfes.com FILTER lmtp-amavis:[127.0.0.1]:10024

The goal is to restrict content filter processing to inbound mail for
the hosted mailboxes. Part of my filter toolbox is dspam. In the past,
I used an opt-in technique where I specifically configured dspam as to
which mailboxes were to be processed - so dspam would take mail
addressed to others and merely pass it along. As this was an extremely
painful way to handle this, I switched to an opt-out technique.

Everything was working just swimmingly, until I saw a message sent by
one of my valid users with a large CC block which included at least one
other local user. This appears to have had dspam process the message
for every recipient of that message - which I decidedly did NOT want.

I'm confident there's a simple, elegant Postfix solution to this.
Probably something that checks the sender address and only performs the
content filter if the sender address is external. I just don't see it
waving at me in the docs. Could someone highlight for me please?

--
Daniel

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