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MAPS is the reverse of SPAM. It stands for Mail Abuse Prevention System. It has 5 lists :

1. RBL
2. DUL (Dialup Users List), contains IP of SOHO and home users
3. RSS (Relay Spam Stopper), hijacked mail servers
4. OPS (Open Proxy Servers), naively open mail servers
5. NML (Non-Confirming Mailing Lists), marketers who use opt-out lists

The history of MAPS is the history of DNSBL itself. It is a pioneer in the antispam field.

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contact : @ychaouche yacinechaouche at yahoocom