Is there an RFC declaring what type of connection sending hosts should communicate via SMTP? I'm sure there is open proxy/zombie using a SDSL or T1 line somewhere on the internet.
Indeed, even computers at the pentagon have been infected.
I think the biggest problem is that a very good spam test turned into a bad/hateful one. Many years ago, MAPS started with their DUL spam database, that listed dial-up lines. That got turned into a list of dynamic IPs. In theory, the dynamic IP list would make for an excellent spam test, since very few legitimate mailservers would have dynamic IPs.
But something happened. They couldn't figure out what IPs were dynamic and what IPs were static. So they deceived -- they said they were listing dynamic IPs, but they refused to remove static IPs! This has happened with all the popular DUL-like spam databases (including MAPS-DUL and SORBS-DUHL).
Once a spam database starts listing IPs that do not meet its listing criteria, and refuse to de-list them, it is no longer useful. What good is a spam database if you have no idea who or what they are going to block?
So these spam databases went from something good (listing dynamic IPs) into something bad (listing IPs they don't like for some reason; today it is static IPs that look like dynamic IPs, but tomorrow it could be requiring T1s).
-Scott
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