From: Noel Jones (njonesmegan.vbhcs.org)
Date: Tue Jul 17 2007 - 10:26:52 CDT

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At 10:10 AM 7/17/2007, Chris Horry wrote:
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>I serve as a backup MX for another host. The occasional spam to invalid
>users at this host gets through my filters and his rejected by the
>downstream host generating a postmaster message. Obviously, I don't
>want to send postmaster bounces to junk e-mail addresses.
>
>Is there a way to block these (relay recipient maps?) from happening
>without blocking legitimate postmaster bounces?

Don't accept mail for unknown recipients.
Either populate relay_recipient_maps with a list of valid recipients,
or use reject_unverified_recipient to probe the downstream server.

http://www.postfix.org/postconf.5.html#relay_recipient_maps
http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient

--
Noel Jones

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