On Thursday 30 October 2003 10:24 am, Ralph Slooten wrote: > > Does anyone know where I can find such information, to ease my troubles? > ;-) I need to find out the full ip-ranges of certain ISP's.
You can get ranges from whois if you really want them. However, you appear to have the opportunity to do the new a valuable service. If you set up your machine to honeypot and tarpit the spammers attempting to use your mail server, you can infuriate them much more than by simply banning the IP range. There is info available on the net to allow you to do that. Short story, you set your machine up so that it doesn't relay deny attempts for relays but simply bitbuckets the message. The spammer, thinking that the relay is working starts a spam run and wastes valuable time sending messages that end up in /dev/null. With the tarpit, you rig your mail server to accept the connection attempt but then receive the traffic e v e r s o s l o w l y, which wastes the spammers time and keep his connections from being used to actually send spam. By the time they figure it out, they have missed the opportunity to send tons of spam that otherwise would have gone out. If you want to find out more, let me know and I can send you some links to point you in that direction. If you simply want to get lists of ISP ranges, or even entire country ranges known to be friendly to spam, you can go to http://www.blackholes.us/ for a lot of ranges to block. Specific spammer ranges are available from http://www.spamhaus.org/rokso/index.lasso and http://www.spamhaus.org/index.lasso, although you can also configure Postfix to use the RBL's directly to block these ranges which saves you time from having to transcribe the list. You can also go here to get a full list of DNSBL's. http://www.declude.com/junkmail/support/ip4r.htm -- Bryan Phinney Software Test Engineer
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