From owner-freebsd-security Tue Sep 21 16:31:42 1999 Delivered-To: freebsd-security@freebsd.org Received: from sand2.sentex.ca (sand2.sentex.ca [209.167.248.3]) by hub.freebsd.org (Postfix) with ESMTP id DA4E914F86 for ; Tue, 21 Sep 1999 16:31:39 -0700 (PDT) (envelope-from mike@sentex.net) Received: from gravel (ospf-mdt.sentex.net [205.211.164.81]) by sand2.sentex.ca (8.8.8/8.8.8) with SMTP id TAA08027; Tue, 21 Sep 1999 19:31:37 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <4.1.19990921194237.05e17600@granite.sentex.ca> X-Sender: mdtancsa@granite.sentex.ca X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1 Date: Tue, 21 Sep 1999 19:45:16 -0400 To: "Mr. K." From: Mike Tancsa Subject: Re: Sendmail blocking of spammers (was Re: hackers?) Cc: security@FreeBSD.ORG In-Reply-To: References: <3.0.5.32.19990921153905.01499100@staff.sentex.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 07:20 PM 9/21/99 , Mr. K. wrote: >> 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 >> >ah, good idea. will that block aol users from accessing my website, >though? You dont have to wrap uniformly for all services. You would do this only for sendmail. e.g. in your /etc/hosts.allow sendmail : .evil.cracker.example.com : deny sendmail : .ipt.aol.com : deny There is generally no reason those dialup customers would want to / need to speak directly to your mail server. ---Mike ********************************************************************** Mike Tancsa, Network Admin * mike@sentex.net Sentex Communications Corp, * http://www.sentex.net/mike Cambridge, Ontario * 01.519.651.3400 Canada * To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message