From: Anne Ramey (annerblast.com)
Date: Fri Aug 26 2005 - 08:28:35 CDT

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I'm setting up a new mail server that is powerful enough to replace the
2 I have running now. I'm hoping to simplify my config as much as
possible, but my problem is this:
Our incoming mail is filtered (spam & viruses) by an outside service, so
we don't want to filter our incoming mail, it's already done.
I'd like to virus filter outgoing mail (especially since this will be
the only check mail from one of our clients to one of our clients recieves)

My puzzle is how to filter outgoing without having incoming go through
amavis at all. I know how to set up amavis to not apply it's rules to
one set while applying them to the other, but there is no reason to send
the incoming mail to amavis at all...it will only slow things down. I'm
thinking two smtp instances on separate IPs, like:

master.cf:

smtp inet n - n - - smtpd
         -o content_filter=

66.45.96.10:smtp inet n - n - - smtpd
         -o content_filter=smtp-amavis:[127.0.0.1]:10024

smtp unix - - n - - smtp
         -o smtp_helo_timeout=3
         -o smtp_connect_timeout=3

And send mail from our filtering service to 66.45.96.10 and have all
outgoing mail send to the main IP. Will this do what I need? What
about the content filter variable that's supposed to be in main.cf?

Last time I had a separate instance of postfix for delivery, but I'm
thinking that is unnecessarily clunky. opinions?

--
Anne

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