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  Re: SPF and Greylisting? (mod 5/31)
by Mouring (136.162.45.33) (mouring@eviladmin.org) on Fri Jul 17 20:38:00 2009 (GMT)
http://eviladmin.org
  [[Quote]]
Google uses SPF to advertise their outgoing mail servers. Can't spamd check if the resend is from a machine authorised by the domain owner and treat it as a valid resend if both the original and the reply are from SPF-approved domains? You'd probably want to ignore ?all records when doing this, but anyone who publishes accurate SPF records could then resend from any of their mail servers.
[[//quote]]

Before being forced to move to postini a few years back due to an email address being bounce-bombed (even at that postini helped half my load, but I still had to apply heavy handed procmail filters). I had a simple script that polled SPF entries for a list of "problem children with SPF records" and built a whitelist file for them every night. It worked well.

A simple extension to support this more natively would be interesting. I'm not sure I would accept every SPF record presnted to me, but allowing it to be used as a white/black list entry may be useful.
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