> i saw the same. however, how is he going to be an 'open relay'
> (to attract spammers) and then be dumping stuff to null?
You don't need to do anything to attract spammers; they just show up. You
don't need to do anything to be probed for being an open relay other than
have an available SMTP port on the internet. Your IP will be probed. I
recently installed a computer on broadband for my uncle. Within 5 minutes
of enabling his computer, the firewall reported the first probes. People
looking for SMTP, MS SQL, and other exploits.
My own firewall tracks in excess of 20 GIGABYTES of probes per month, all
courtesy of Windows machines.
Our public mail server blocks anywhere from a few 100 spams per day to
1500+. They seem to run in waves. The numbers were much higher when we
first started the server, but they seem to have dropped off; perhaps the
spambots are realizing that we aren't productive for them.
In any event, since he isn't actively rejecting them (from their
perspective), they'll assume that he is an open relay. Unlike DNSRBL
scanners, which wait to get a reply.
--- Noel
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