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Re: Policy based spam filtering

The most egregious abusers that I see now are doing:


in the SMTP transaction, and

	From: randomname@valid.domain
	Errors-To: anotherrandomname@different.valid.domain
or	Errors-To: samenameeachtime@different.valid.domain

in the headers.

They send this with the typical relay via hundreds or thousands of hosts around the world.