As I said, I find the variation from ISP to ISP dramatic and inexplicable.
It's happened to several times, when I pick up a new blacklist or rule that does extremely well on one site, and then take it another site, excited to see excellent increment of rejects, and blah, nada.
I, too, have found that different domains have different "spam profiles" -- in this case, meaning the type of spammers that target them (which affects the amount of spam they receive, and the type of spam). For example, a domain that has been around for many years will be on lots of "Millions of E-mail addresses" CD-ROMs, which attracts different spammers than a newer domain that is in lots of search engines (where the addresses are harvested from the web site). And, addresses that come from dictionary attacks typically attract hard-core spammers.
-Scott
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