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Re: Implementing anti-abuse techniques on ISP networks....
> From [email protected] Wed Aug 6 19:10 EDT 1997 > Date: Wed, 6 Aug 1997 19:09:15 -0400 (EDT) > From: Jon Lewis <[email protected]> > To: Andy Pitts <[email protected]> > cc: [email protected] > Subject: Re: Implementing anti-abuse techniques on ISP networks.... > MIME-Version: 1.0 > > On Wed, 6 Aug 1997, Andy Pitts wrote: > > > I too, am a small Internet Service Provider, and I too, don't want > > to block sites that my users may want to access. But there seems > > to be a few domains that do nothing but generate spam. Am I not > > providing a service to my users if I prevent them from being > > smothered with spam from those sites? > > The issue is that there are ISPs that have filters such that their dialup > customers cannot talk to port 25/tcp of systems elsewhere on the net. > Customers have to use the provider's SMTP servers. The question is, is > this a good thing? I don't think anyone would argue against UUNet and PSI > doing this with the *.ms.uu.net dialups or the *.pub-isp.psi.net...but > would you do this on your own network? > > I've blocked 4 ms.uu.net /16's and 12 pub-isp.psi.net /24's from talking > directly to FDT's mail servers. Unfortunately, most of the junk from PSI > is relayed through other sites anyway. I'm not blocking anyone from port 25, *but* I have installed the ruleset in out sendmail to make it reject any mail that does not originale or terminate in our domain. This put a halt to the rash or relaying problems we had some months ago, but down not affect our users in any way. -- Andy Pitts : "Knowledge is a deadly friend [email protected] : When no one sets the rules." http://www.rbdc.com : --King Crimson--