ietf-822
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Re: Statistics of "intelligence" in e-mail spams

2001-01-23 09:27:30
This approach certainly isn't perfect.  But simply opening a connection to
the sending host and checking RCPT TO: 
<somewhere(_at_)your_own_domain(_dot_)whatever>,
looking for a 250 OK message before rejecting, then failing safe (i.e.
accepting anything where you can't connect to the host) might tend to slow
down a large hunk of spam.

Then blocking incoming traffic to port 25 would be even more effective.

It's simply incorrect to assume that the host that is sending you mail
is an authoritative MX for the domain that is sending you mail.  If you
do this you will be causing a significant number of delivery failures
for legitimate mail.

Keith