On Wed, 29 Oct 2003, Justin Mason wrote:
> Look at any message that matches various patterns for a DSN (Subject =~
> /undeliverable/, etc.).
> If it does not contain the IP address of his network or outgoing relay,
> drop it, it's a bounced forgery.

Again, this works in *most* cases, but there are some (poorly written)
systems that return the mail without the 'Received' headers quoted. 
So the check would have to be complicated enough to determine that the
'Received' headers were indeed quoted, but did not contain the IP address
for the local network....

- Charles



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