Zitat von srach <hndls...@tutanota.de>:
I have read the documents for some different Greylisting opportunities for Postfix This built into Postfix http://www.postfix.org/SMTPD_POLICY_README.html#greylist and popular ones http://wiki.policyd.org http://postgrey.schweikert.ch I am not finding a modern comparison of these and a decision point for choosing one to use best in the latest Postfix versions. Many online postings have a comment but they are most for older versions of Postfix. I wonder if Postfix with modern versions is integrating better ideas and to do it all in one? I think maybe that the choice is not just the recommended built in one of Postifx? It depends on the goals? My interested goals are to block spam with Spamassassin block viruses with ClamAV greylist mail from freemail domains with one policy greylist mail from certain countries with another policy
Don't do this. Greylisting should not be used to punish real MTAs. Use Greylisting with automatic whitelist so only the Spam-Bots get cut away and let already know MTAs pass by. Works exceptionally well here, the Bots go away after 2-3 tries and 90% of the sending MTAs are on the whitelist after some time.
Regards Andreas
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