RBL blocking emails by mistake?

Drew Marshall drew at
Tue Sep 12 17:27:39 IST 2006

On Tue, September 12, 2006 17:02, Scott Silva wrote:
> All they have to do is get your system to bounce the message. If they
> happen
> to know where the spamtrap is, and you don't, then you really have no way
> of
> catching it.
> As simple as this;
> Mailfrom Spoofed spamtrap address
> mailto nonexistant user at yourdomain
> Your server bounces with no user by that name because RFC's say you are
> supposed to bounce it.
> You are slammed into a spamcop blacklist.
> Unless spamcop has gotten smart enough to screen out bounces, which they
> didn't do when I got hit. Or you have some mechanism of verifying the
> sender
> (milter-sender or some equivalent). Yes, I'm not just a ranter, I'm also a
> victim.

Some would argue should you even be accepting mail for non existant users?
If you reject these at SMTP stage then it's not your relay that does the
bouncing and therefore not your problem :-)


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