From owner-freebsd-questions@FreeBSD.ORG Sat Feb 25 19:18:57 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 30CF7106566C for ; Sat, 25 Feb 2012 19:18:57 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from plane.gmane.org (plane.gmane.org [80.91.229.3]) by mx1.freebsd.org (Postfix) with ESMTP id D7DE18FC20 for ; Sat, 25 Feb 2012 19:18:56 +0000 (UTC) Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1S1N8v-0003TV-LN for freebsd-questions@freebsd.org; Sat, 25 Feb 2012 20:18:53 +0100 Received: from pool-173-79-99-96.washdc.fios.verizon.net ([173.79.99.96]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 25 Feb 2012 20:18:53 +0100 Received: from nightrecon by pool-173-79-99-96.washdc.fios.verizon.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 25 Feb 2012 20:18:53 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Michael Powell Date: Sat, 25 Feb 2012 14:19:07 -0500 Lines: 39 Message-ID: References: <863259E16B6C464DAD1E9DD10BB31154059CFBAE@wmsexg01.corp.cellularatsea.com> <4F48BAF6.9070204@ifdnrg.com> <863259E16B6C464DAD1E9DD10BB31154059CFBE7@wmsexg01.corp.cellularatsea.com> <4F48EC21.7040805@ifdnrg.com> <863259E16B6C464DAD1E9DD10BB31154059CFBEE@wmsexg01.corp.cellularatsea.com> <4F48F45F.4080304@ifdnrg.com> <4F492262.5090505@radel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: pool-173-79-99-96.washdc.fios.verizon.net Subject: Re: Email issues, relay failure X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: nightrecon@hotmail.com List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Feb 2012 19:18:57 -0000 Jon Radel wrote: > On 2/25/12 10:26 AM, Bender, Chris wrote: > >> >> On telnet w IP it says unable to connect. > ... >> Its weird that the delivery on A says deferred connection timed out but >> on tcpdump I see the port 25 > > > If you can't establish a TCP connection from A to your relay server on > port 25, I'd expect all of the above. If you can't establish a TCP > connection to port 25 at all from A, I'd stop focusing on the details of > the e-mail server on the relay machine (as they're likely to be beside > the point) and start focusing on what is blocking the traffic from A. > Have you audited all the firewalls involved? To be really focused, if > you see traffic (both ways) at the relay server when A tries to talk to > port 25, but A is convinced that no TCP connection is established, > either you're stomping on things at the relay server (do your attempts > to telnet to port 25 fail immediately or just sit there for a good long > time and then fail?), the reply packets from relay to A are getting > mis-routed, or A is ignoring the packets coming in from the relay. Can > you ping from the relay to A? > > There's a distinct difference between failure to establish a TCP > connection (look to the network stuff) and the e-mail server giving you > an error response rejecting your attempt to transfer mail or just > quietly loosing the mail (look to the e-mail servers). > It can also depend on a difference between residential vs business account at the ISP between them. If it was working fine and absolutely nothing was changed at either end, one posibility is an ISP implemented a policy of forcing mail submission to port 587, and whatever blocking they then started on port 25 is what broke the connection. -Mike