From owner-freebsd-questions@FreeBSD.ORG Sat Aug 14 18:08:25 2010 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 936A0106566B for ; Sat, 14 Aug 2010 18:08:25 +0000 (UTC) (envelope-from mikel.king@olivent.com) Received: from mail.olivent.com (mail.olivent.com [75.99.82.91]) by mx1.freebsd.org (Postfix) with ESMTP id 2A6848FC17 for ; Sat, 14 Aug 2010 18:08:21 +0000 (UTC) Received: from localhost ([127.0.0.1]) by mail.olivent.com (Kerio Connect 7.0.0 patch 1) (using TLSv1/SSLv3 with cipher AES128-SHA (128 bits)); Sat, 14 Aug 2010 13:37:29 -0400 References: <20100814172307.035661065697@hub.freebsd.org> Message-Id: From: mikel king To: peter@vfemail.net In-Reply-To: <20100814172307.035661065697@hub.freebsd.org> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v936) Date: Sat, 14 Aug 2010 13:37:27 -0400 X-Mailer: Apple Mail (2.936) Cc: freebsd-questions@freebsd.org Subject: Re: Open Mail Relay 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: Sat, 14 Aug 2010 18:08:25 -0000 On Aug 14, 2010, at 9:29 AM, peter@vfemail.net wrote: > > I have a machine running FreeBSD, sendmail and majordomo. I have > someone who is on one of those majordomo lists complaining that they > are receiving spam from me. The complainer says I have an open mail > relay that I need to fix. > > I went to http://www.abuse.net/relay.html > to test the machine using its IP address. Abuse.net gives a clean > bill of health, saying relaying was denied in 17 separate tests. > > I've reviewed my mail logs for the past couple of days and I can't > find any entries for any mail addressed to the complainer's domain > name except mail that should have been sent. > > Is Abuse.net's test adequate to rule out an open mail relay problem? > Peter, I usually attempt to send from a remote site myself directly before I sign off on closing that whole. In addition I always request that the complaint include a complete copy of all offending messages so that I can properly examine the headers. It is entirely conceivable that the complaint about an open relay is valid, but not from your server but an impostor. In that case you could try setting a SPF record in your DNS to help reduce such impersonations, although that is not a guarantee. If you have any questions ping me off list. Regards, Mikel King Senior Editor, BSD News Network Columnist, BSD Magazine CEO, Olivent Technologies ~because IT matters~ http://olivent.com 6 Alpine Court, Medford, NY 11763 o: 631.627.3055 http://www.linkedin.com/in/mikelking http://twitter.com/mikelking