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Subject: Re: Can you block spam by verifying the sender's return address in Postfix?
From: Ben Elliston (bjeair.net.au)
Date: Fri Oct 20 2000 - 20:56:29 CDT

   I'm not at all saying to do this instead of the RBL's, etc. I'm
   thinking that they don't catch everything and that this would be
   another layer of filters that the email would have to go through in
   order to be delivered locally. I'm just looking for more agressive
   spam filtering techniques that don't block valid email.

These techniques would also slow your mail throughput down *lots*.

Ben