From owner-freebsd-questions@FreeBSD.ORG Fri Jun 29 06:12:39 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 7795E16A41F for ; Fri, 29 Jun 2007 06:12:39 +0000 (UTC) (envelope-from tedm@toybox.placo.com) Received: from mail.freebsd-corp-net-guide.com (mail.freebsd-corp-net-guide.com [65.75.192.90]) by mx1.freebsd.org (Postfix) with ESMTP id 3DAF213C469 for ; Fri, 29 Jun 2007 06:12:39 +0000 (UTC) (envelope-from tedm@toybox.placo.com) Received: from TEDSDESK (nat-rtr.freebsd-corp-net-guide.com [65.75.197.130]) by mail.freebsd-corp-net-guide.com (8.13.8/8.13.8) with SMTP id l5T6Cbie043646; Thu, 28 Jun 2007 23:12:38 -0700 (PDT) (envelope-from tedm@toybox.placo.com) From: "Ted Mittelstaedt" To: "RW" , Date: Thu, 28 Jun 2007 23:13:10 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1896 In-Reply-To: <20070628015105.77775b61@gumby.homeunix.com.> Importance: Normal X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (mail.freebsd-corp-net-guide.com [65.75.192.90]); Thu, 28 Jun 2007 23:12:38 -0700 (PDT) Cc: Subject: RE: Gradual move to own mail server - strategy for noob X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jun 2007 06:12:39 -0000 > -----Original Message----- > From: owner-freebsd-questions@freebsd.org > [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of RW > Sent: Wednesday, June 27, 2007 5:51 PM > To: freebsd-questions@freebsd.org > Subject: Re: Gradual move to own mail server - strategy for noob > > > On Wed, 27 Jun 2007 10:27:56 +0100 > Barnaby Scott wrote: > > Ultimately, but not yet, I want to start using the FreeBSD machine as > > a proper mailserver - i.e. get a static IP address and point the MX > > record hosted by my provider at it. > > It may not be sufficient to get a static IP address. If you wish to > send out mail directly, you really need one with control of reverse > DNS, since that's the criterion for getting out of dynamic > address blocklists. No, not exactly, this is a simplification. Some don't pay attention to PTR's. The correct way is to resolve the hostname passed in the HELO and compare the IP that results to the senders IP. Some lists do that some don't when looking at removal requests. You really need a /24 subnet to be free of this. A number of the blacklists these days are making the very ignorant assumption that if a single IP in a /24 is spamming, that it is OK to block the entire /24. The idea is if we disrupt traffic enough the ISP will magically step in and do something about it. I don't know exactly why these blacklist owners seem to have settled on a /24, they probably got C's in their classes in school so have an especial affinity for the deprecated-years-ago term "class C IP subnet" Any ISP these days handing out static IP's has a mechanism for putting in a PTR record. Ted