Re: Spam Filter

On Tue, 2006-06-27 at 03:11, jdow wrote:

Rejecting the mail during the *SMTP* transaction *never* involves any
hosts or addresses mentioned in the message headers. It is a TCP
protocol-level thing only involving the peers: the sending host and
your receiving host. It's impossible to involve a third party.

Of course, that was the point Paul was making.

That is, of course, the right way to do it. But after being on the
receiving end of a joe-job in the past I am a little "sensitive" to
the issue. And SOME people, probably not Paul on second thought (sorry
it was not first thought, Paul), are a little careless with regards
to "reject" and "bounce".

If the mail has already been forwarded through a normal
relay, it doesn't matter whether the next hop accepts and
generates a bounce or it rejects with a 5xx status. The
rejection will force any standards-conforming mailer to
generate a bounce back to the sender - even if the sender
address was forged. The only difference is that the
reject saves your own machine the trouble of constructing
and trying to return the bounce message. A lot of
spam-spewing software sends directly though and a
rejection is the end of it.

--
Les Mikesell
lesmikesell@xxxxxxxxx


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