> -----Original Message-----
> From: owner-postfix-us...@postfix.org 
> [mailto:owner-postfix-us...@postfix.org] On Behalf Of Dennis Carr
> Sent: Tuesday, 14 April 2009 12:15 PM
> To: postfix-users@postfix.org
> Subject: A better backscatter killer?
> 
> Looking at options here for eliminating backscatter.  
> 
> 
> One thing I've been looking at doing is basically checking 
> headers, and if the From: header is null, then reject it immediately.
> 

Then you won't receive some genuine messages, both bounce and
non-bounce.

Try the ips.backscatterer.org RBL; it works well for us.

http://www.mailinglistarchive.com/postfix-users@postfix.org/msg57402.htm
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