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Originally Posted by wibbly
Well, my ISP uses an "anti-backscatter" technique of looking at the domain of the sending SMTP server and comparing it to the domain where the mail came from. Maybe you have something similar going on...
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I believe it may be something called Sender Policy Framework (SPF). We use it here on our servers. More and more mail servers are intergating it at the SMTP level.
For more information see:
http://www.openspf.org/