From: Roger Waterhouse (rogerwwaterworks.dyndns.org)
Date: Tue Aug 03 2004 - 17:13:20 CDT

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Hi;

I have a fairly complex setup with a postfix/amavisd/spamassassin system
in between a sendmail (MX) system and a MS Exchange system. Due to the
massive increase in dictionary attacks we have been seeing, we want to
start rejecting unknown users. Ideally this would be done on the
sendmail system, but are not sure if that can be done.

I know how to do this with postfix, using the getadsmtp perl script, but
I am concerned about the fact that if we reject with 550, the MX will
then be responsible for sending out DSN's. How can I "silently" reject
unknown users so that mail sent to an unknown user is not processed and
the sending MTA is none the wiser? I assume that
unknown_local_recipient_code would be used, but I'm not sure what code
to use.

Cheers
Roger

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