From owner-freebsd-questions@FreeBSD.ORG Thu Jan 4 02:53:07 2007 Return-Path: X-Original-To: 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 5BCD816A407 for ; Thu, 4 Jan 2007 02:53:07 +0000 (UTC) (envelope-from sahil@tandon.net) Received: from smtp02.lnh.mail.rcn.net (smtp02.lnh.mail.rcn.net [207.172.157.102]) by mx1.freebsd.org (Postfix) with ESMTP id 1A19413C44B for ; Thu, 4 Jan 2007 02:53:06 +0000 (UTC) (envelope-from sahil@tandon.net) Received: from mr08.lnh.mail.rcn.net ([207.172.157.28]) by smtp02.lnh.mail.rcn.net with ESMTP; 03 Jan 2007 21:24:40 -0500 Received: from smtp01.lnh.mail.rcn.net (smtp01.lnh.mail.rcn.net [207.172.4.11]) by mr08.lnh.mail.rcn.net (MOS 3.7.5a-GA) with ESMTP id IBB24505; Wed, 3 Jan 2007 21:24:37 -0500 (EST) Received: from 209-122-188-192.c3-0.avec-ubr15.nyr-avec.ny.cable.rcn.com (HELO [192.168.1.107]) ([209.122.188.192]) by smtp01.lnh.mail.rcn.net with ESMTP; 03 Jan 2007 21:24:38 -0500 Message-ID: <459C6565.9020409@tandon.net> Date: Wed, 03 Jan 2007 21:24:37 -0500 From: Sahil Tandon User-Agent: Thunderbird 1.5.0.9 (Macintosh/20061207) MIME-Version: 1.0 To: FreeBSD-questions References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Junkmail-Status: score=10/50, host=mr08.lnh.mail.rcn.net X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A090205.459C63BB.007F,ss=1,fgs=0, ip=207.172.4.11, so=2006-05-09 23:27:51, dmn=5.2.125/2006-10-10 Cc: Subject: Re: Is there a solution for 550 User Unknown mails 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: Thu, 04 Jan 2007 02:53:07 -0000 Derrick Ryalls wrote: > This is perhaps off topic, but all machines in question are running > FreeBSD :) This problem is related to the configuration of your MTA, not FreeBSD. > Every day I get dozens of failed email notifications in the form of: > > UNDELIVERABLE MAIL Your message to the following recipients cannot be > delivered: : webmail.hansenet.de > [213.191.73.2]: > > RCPT TO: > > <<< 550 RCPT TO: User unknown [...] > With secondary mail servers, I am accepting mail for other domains, > and then forwarding them on. It is my belief that acting as a > secondary mail server is what is causing me to receive all these > errors. [...] > Assuming that my guessing is correct, is there any way to stop this > flood of reject emails short of not being a secondary server for > anyone? Which MTA? In Postfix, you can use the relay_recipient_maps parameter to query a list of valid recipients. The MX for which you're acting as secondary should be able to provide the list. -- Sahil Tandon