From owner-freebsd-questions@FreeBSD.ORG Wed Aug 6 10:14:13 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 03B7A37B401 for ; Wed, 6 Aug 2003 10:14:13 -0700 (PDT) Received: from galilee.polands.org (CPE-24-208-57-240.new.rr.com [24.208.57.240]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2C04E43F3F for ; Wed, 6 Aug 2003 10:14:12 -0700 (PDT) (envelope-from djp@polands.org) Received: from sheba.polands.org (sheba.polands.org [172.16.1.33]) by galilee.polands.org (8.12.9/8.12.9) with ESMTP id h76HE9NP031313; Wed, 6 Aug 2003 12:14:09 -0500 (CDT) (envelope-from djp@polands.org) Received: from sheba.polands.org (localhost [127.0.0.1]) by sheba.polands.org (8.12.9/8.12.9) with ESMTP id h76HE9wd000485; Wed, 6 Aug 2003 12:14:09 -0500 (CDT) (envelope-from djp@sheba.polands.org) Received: (from djp@localhost) by sheba.polands.org (8.12.9/8.12.9/Submit) id h76HE9p0000484; Wed, 6 Aug 2003 12:14:09 -0500 (CDT) Date: Wed, 6 Aug 2003 12:14:09 -0500 From: Doug Poland To: Bruce Pea Message-ID: <20030806171408.GA459@polands.org> References: <19175993.1060169841@[192.168.10.11]> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <19175993.1060169841@[192.168.10.11]> User-Agent: Mutt/1.5.4i cc: questions@freebsd.org Subject: Re: ISPs blocking SMTP connections from dynamic IP address space X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Aug 2003 17:14:13 -0000 On Wed, Aug 06, 2003 at 11:37:21AM -0500, Bruce Pea wrote: > --On Wednesday, August 06, 2003 12:33 PM -0400 Steve Hovey > > > >I now block ip's with no reverse dns > > We are doing this as well. We get a fair number of complaints from people > who's mail doesn't get delivered but we tell them to fix their DNS so we > know someone isn't trying to spoof us. So far, 23 out of 25 organizations > complaining have fixed their DNS. > This isn't a reverse DNS issue. This is the connecting host with an IP address in a range ISP's have decided is "dynamically assigned". This IP address range is then blocked from connecting on port 25. I believe the FreeBSD mail servers use reverse DNS to help control spam and I'm OK with that. I have resolvable DNSs but am being blocked because my IP is in Roadrunners 24. network. -- Regards, Doug