Using watermark to fight spam backscatter

Kai Schaetzl maillists at
Thu Apr 3 14:31:17 IST 2008

Edward Prendergast wrote on Thu, 03 Apr 2008 13:05:34 +0100:

> But after changing this and checking the incoming mail I've noticed
> a lot of backscatter doesn't come with From: <> but rather real
> e-mail addresses (e.g. MAILER-DAEMON at

Are you sure that this is the *envelope-from* ? The *mail header* may 
indeed contain an address like the above!
Be aware that using watermarking to reject may also reject legitimate mail 
and receipts. Search this list for old discussions about this.


Kai Schätzl, Berlin, Germany
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