OSEC

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check if mx is bypassed

From: Andreas Grimm (grimm.andreasyahoo.com)
Date: Thu Nov 01 2007 - 17:34:22 CDT

I puzzle if postfix has a hidden switch to detect whether a client relays to the mx or not, and reject the message in the latter case. The problem is that the mailservers behind my mx, have still to receive mails from the outside without authentication, because some customers won't update their dns (no i can't oblige). So i receive mails that are sent directly to the A record. I wrote a policy-service that performs such a check, and rejects the request, but has postfix something build-in? Andreas __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com