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From: Bill Weiss (houdini+postfixclanspum.net)
Date: Sat Jul 21 2007 - 12:27:00 CDT
Justin Piszcz(jpiszczlucidpixels.com)Sat, Jul 21, 2007 at 07:38:54AM -0400:
> I did not have debug enabled when this happened, but how can someone cause this
> who is not whitelisted? They appear to have made the mail server send a bounce
> back to them?
I've been seeing this for over a year. It's obnoxious, but doesn't seem
to do much harm. If the spammers started using it a lot it would be a
source of backscatter.
I suspect some failing spam-ware does this, because the message that goes
back to the "sender" isn't very conducive to advertising.