Don't even try.Hello, I use the router to filter messages using the Return-Path, but suddenly I'm getting messages (supposedly from Postmasters and MAILER-DAEMONs but clearly SPAM) where the first line is:Return-Path: <> What can I enter to block such messages?
All messages generated by MTA's should have a null sender like that. Bounces, return reciepts, etc. all have an empty return-path by design. If you reject mail that has an empty return-path you will be rejecting some spam but you will reliably reject all error messages as well.
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Bill Cole
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