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| Subject: | Re: Discovering users by RCPT TO |
|---|---|
| Date: | Sat, 15 Jan 2005 10:35:19 +0200 |
I see spammers hitting my MTA daily with dictionary RCTP TO queries and there isn't much you can really do against it; however I have been thinking about a solution using real time blockers.
The idea is to monitor the logfile of the MTA, looking for a host getting more than "X" failed destination addresses (I think 2 or 3 is a nice entry threshold). Then when they reach the threshold their IP gets put into a local DNS server that is used by the MTA to as a real time blocker.
This wouldn't' require more than another RBL addition to the MTA and then an external script tied to either bind or djbdns.
thoughts? dmz
-- [Name ] :: [Matan I. Peled ] [Location ] :: [Israel ] [Public Key] :: [0xD6F42CA5 ] [Keyserver ] :: [keyserver.kjsl.com] encrypted/signed plain text preferred
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