On Mon, 6 Jun 2005, Kern Sibbald wrote:

Like me, for instance. For some reason(*) a couple of my personal domains
feature quite frequently in spam forgeries.

, I prefer to try to inform real users that
their message has not been accepted -- sending back a rejection message
is what 99.9% of all mailers do anyway ...

No, what 99.9% of mailers do is reject at SMTP transaction stage.
Accept-then-bounce is called outscatter and is rapidly becoming socially
unacceptable, with technical means (ie, blacklisting) being used to give
the diaapproval some teeth.

I don't see the difference, unless I am mistaken, in both cases the message
goes back to the same place.

The difference is that the reject/failure message is sent by the SMTP _ORIGIN_ host, not the receiving one.

In the case of spam forgeries, 99.999% of the SMTP originators are zombie SMTP clients, not servers, so no bounce is generated.


FWIW, Spamcop now treats outscatter reject notices for spam forgeries as spam from the outscatter system, so do a number of other spam filtering systems and sites - including AOL and Hotmail.


(*) Those who know me, know how much I've annoyed spammers and spam
     supporting networks over the last 15 years....

I'm not sure if you are talking about actively annoying spammers.

I'm sure running a blacklist counts as actively annoying 'em.

AB


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