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* [[Real-Time Blackhole List]] ([[RBL]]), the one for which MAPS is probably best known.
* [[Dialup Users List]] ([[DUL]]), blocks of [[IP address]]es that include many small office and home office users.
* [[Relay Spam Stopper]] ([[RSS]]), [[spam]] relays, e.g. hijacked [[server]]s.
* [[Open Proxy Servers]] ([[OPS]]), naively open [[SMTP]] [[server]]s.
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