ScamNet

This mod allows you to catch all members messages if message text contains predefined phrases - phrases of spam, scam, threat, unquotable words, etc. ScamNet will catch those messages and block them thus no actual delivery will occur to the recipient. All captured messages are stored in the database awaiting for your decision. With such a messages you can make one of these actions:
1) Allow selected messages. Messages would be send to the recipient.
2) (new) Mark senders as trusted. This will exclude those profiles from analyzing their messages.
3) Drop selected Messages. Messages would be permanently deleted.
4) Drop selected Senders. All senders would be permanently deleted (with all their messages and all data relative to their profiles). Also if you have our AMS (http://www.boonex.com/m/Access_Management_System_1_0_0) or AMS2.0 (http://www.boonex.com/m/Access_Management_System_2_0_0) installed then this action would also ban senders' IPs from accessing the site.
5) If you're running dolphin 6.1 version, you can also ban senders for the selected hours count. Also from the same page you can contact Sender by sending him a message from administration (warning, notice, reprove, etc.)

You're able to set up the list of phrases to search. You can just list those phrases. Or, if you familiar with regular expressions, you can write a complex message filter using regexp. For example you can catch all messages which contains some email addresses. You can contact me if you need some specific regular expression. You even can premoderate absolutely all messages by using a wildcard ".+" as a phrase to search. Say NO to spammers and rude fellows. :)

UPDATE: Now the module also automatically catches duplicate messages from the same sender. F.ex. if a member send 2 or more exactly the same messages then the second one (and all that possibly will follow it) will be captured automatically.

P.S. You may also be interested in
Messages Spy
Simple Messenger Spy
Simple Chat Spy