10 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Filter some postm...
FromSent OnAttachments
Antonio Di MonacoFeb 21, 2007 1:42 pm 
C. J. MeidlingerFeb 22, 2007 4:24 am 
Antonio Di MonacoFeb 22, 2007 5:44 am 
C. J. MeidlingerFeb 22, 2007 6:28 am 
Gordon MessmerFeb 22, 2007 7:01 am 
Antonio Di MonacoFeb 22, 2007 7:17 am 
Marcin SemeniukFeb 22, 2007 7:27 am 
Otto SolaresFeb 22, 2007 8:18 am 
Gordon MessmerFeb 22, 2007 9:09 am 
Alessandro VeselyFeb 22, 2007 11:22 pm 
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Subject:Re: [courier-users] Filter some postmaster messagesActions...
From:Alessandro Vesely (ves@tana.it)
Date:Feb 22, 2007 11:22:42 pm
List:net.sourceforge.lists.courier-users

Antonio Di Monaco wrote:

<KNOWN_USER@CORRECT_DOMAIN>: <<< Mail loop - already have my Delivered-To: header.

The spammer sent a message to KNOWN_USER and specified UNKNOWN_USER as the sender. The original message intentionally included a Delivered-To header. Courier checks that header during local delivery - where genuine mail loops most likely originate.

You need to filter that trick at the SMTP level, doing a case sensitive comparison between KNOWN_USER@CORRECT_DOMAIN an the value in the Delivered-To header. (That's what local delivery does.)