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Threshold: Help

  SPF and Greylisting? (mod 5/31)
by David Chisnall ( on Fri Jul 17 10:26:12 2009 (GMT)
  I know there is some resistance to SPF from spamd, but doesn't it solve exactly this problem? 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.
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