nondelivery problems

[Drew Marshall]

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Lekas, Kosta wrote:

      How do I prevent postfix from generating and trying to send
      non-delivery reports to non-existent recipients at valid
      domains?

Look at the wikihttp://wiki.mailscanner.info/doku.php?id=documentation:configuration:mta:postfi
:how_to:reject_non_existent_users will tell you how to reject unknown
users at SMTP stage rather than at delivery (Which is what is happening
now).

      I think this usually happens when some spammer tries to send
      mail to an invalid recipient at my domain. The spammer uses a
      fakeAddress at existingDomain.com. I fear I will get blacklisted
      if this continues.

And use huge amounts of pointless bandwidth, cpu and other resources and
you will struggle to keep up if you get hit with a true 'directory'
attack.

Drew

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