From: Mike Kenny (inzanixgmail.com)
Date: Fri Apr 06 2007 - 09:24:29 CDT

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We have problems where some of our users abuse the system and send spam
(knowingly or unknowingly) from our dynamic IP addresses.
This is not a problem for us if those users use our own smtp servers as our
spam filtering seems to be adequate (for the moment), but many of our users
connect directly to other smtp services (gmail, yahoo, etc.) ad bypass our
spam filters. The end result of this is that the upstream smtp service
eventually blocks that IP address which causes problems for our other,
better behaved, users. And, ultimately, for us.
We want to relay all port 25 traffic through our own smtp servers so that we
can filter spam properly, prior to relaying the mail to the upstream host.
Since the upstream hosts will most often require authentication and we don't
have access to the authentication databases we want to be able to elay the
credentials provided to us to the end destination for authentication.
Is this possible with postfix?
If so, what is involved?

Thanks

mike

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