Quoting Jimmy Tang (jtang at tchpc.tcd.ie):
> have people tried no-listing? setting up the primary mx record such
> that it *does not receive mail* at all, and working on the assumption
> that a real mailer will fall back to the secondary(s) to try and send
> the mail, where in the case of a spammer they are less likely to try
> again on the secondary which will do your usual filtering if you
> need/want it to.
Brilliant idea. Haven't tried it.
> I guess the only problem is those mail appliances and some mail
> servers out there arent compliant with standards and dont fall back to
> the secondary and end up never sending mail.
The most-obvious example being our friend qmail.
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