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RE: SMTP relaying policies for Commercial ISP customers...?
On 2004-02-13T15:30-0600, Ejay Hire wrote: ) You could use AOL's tactic and transparent proxy all ) outbound port 25 traffic. Then it'd be a relatively simple ) matter to add mr. spammer's ip to a hosts.deny. If you were You may also need to filter inbound packets with a source port of 25, or any other ports you capture. As I believe has been mentioned here before, some spammers may use a dialup account just for its IP address, collecting return packets on the dialup interface but sending the actual content through some higher-bandwidth, unfiltered pipe. Filtering what goes out over the dialup account would be largely ineffective in this case, as nothing actually needs to be sent through that interface for the transmissions to succeed. -- Daniel Reed <[email protected]> http://naim-users.org/nmlorg/ http://naim.n.ml.org/ "True nobility lies not in being superior to another man, but in being superior to one's previous self."