Date: Tue, 21 Sep 1999 15:39:05 -0400 From: Mike Tancsa <mike@sentex.net> To: "Mr. K." <bsd@a.servers.aozilla.com> Cc: security@FreeBSD.ORG Subject: Sendmail blocking of spammers (was Re: hackers?) Message-ID: <3.0.5.32.19990921153905.01499100@staff.sentex.ca> In-Reply-To: <Pine.BSF.4.10.9909211518030.3358-100000@inbox.org> References: <3.0.5.32.19990921145047.013e24b0@staff.sentex.ca>
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>I think I figured out what is happening. The relaying is indeed getting >denied, but unfortunately some of the spammers software is waiting blindly >for a positive response (and thus keeping a connection until they time >out). My choices seem to be ipfw (which I don't want to do as I don't >want to block all aol users), or somehow getting sendmail to disconnect on >a "relaying denied" (instead of sitting there until they timeout). I >can't figure out how to do the latter (doesn't seem to be possible). And >of course calling AOL and bitching, at least that will feel good if I can >get a bunch of these spammers booted. You have another option. If you have tcp_wrappers installed (its installed in all 3.[2|3] versions by default), you can deny by sub domain. The spammers are coming from *.ipt.aol.com. Block from that subdomain on. AOL for its mail exchangers are all of the form xx.mx.aol.com, not ipt.aol.com e.g. aol.com preference = 15, mail exchanger = zd.mx.aol.com ---Mike ------------------------------------------------------------------------ Mike Tancsa, tel 01.519.651.3400 Network Administrator, mike@sentex.net Sentex Communications www.sentex.net Cambridge, Ontario Canada To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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