Mailing List Message #99533
From: Massimo Bolzoni <>
Subject: Re: Released: ListBackscatter v1.0, to reduce backscatter caused by the LIST module
Date: Wed, 24 Feb 2010 18:29:50 +0100
To: CommuniGate Pro Discussions <>
X-Mailer: Apple Mail (2.936)

question: also using syncronous mode the list module reply back NOT on the smtp channel? I got it correct?



Il giorno 24/feb/10, alle ore 18:15, Nicolas Hatier ha scritto:

This new filter reduces the backscatter caused by the Communigate Pro LIST module.

The CGP LIST module processes the received messages only after it has been accepted at SMTP level. When spammers attack a server, they may attack a list address, and this will likely cause backscatter (bounces) to the random third-party addresses used by the spammer. This may even get your server listed in a few DNSBL such as SpamCop's or's.

The List Backscatter Filter reduces the avoidable bounces by matching the message sender with the subscriber list, and rejecting unauthorized addresses at SMTP level, with the help of CGP synchronous rules (CGP 5.1+)

Future versions may be enhanced with new verifications for other causes of backscatter. Suggestions / comments welcome.

Best regards
Nicolas Hatier


Nicolas Hatier, ing. <>
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Massimo Bolzoni - Solution Architect
CommuniGate System Inc. - CommuniGatePro -
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HP Inc. - Polyserve Matrix Server -
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