From: Walter Heukels (walterbadexample.net)
Date: Tue May 13 2008 - 09:15:48 CDT

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> I need to relay for customers who also have a existing setting for
> Outbound Auth SMTP in there client, i.e Outlook with the tick in the
> server required authentication.

My company does this for a hotspot provider; the way I solved it is to
allow relaying for authenticated connections, and make sure the
authentication always succeeds. I configured saslauthd to use PAM and
used pam_permit.so for the SMTP service. You'll want to look up SASL and
PAM documentation for this.

I guarantee you will get people sending viruses and spam from infected
laptops. I implemented virus scanning and rate limiting to combat this,
which is working fine so far.

Walter

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