From owner-freebsd-chat Tue Feb 26 1: 8:23 2002 Delivered-To: freebsd-chat@freebsd.org Received: from snipe.prod.itd.earthlink.net (snipe.mail.pas.earthlink.net [207.217.120.62]) by hub.freebsd.org (Postfix) with ESMTP id ACD9937B405; Tue, 26 Feb 2002 01:08:18 -0800 (PST) Received: from pool0152.cvx22-bradley.dialup.earthlink.net ([209.179.198.152] helo=mindspring.com) by snipe.prod.itd.earthlink.net with esmtp (Exim 3.33 #1) id 16fdar-0006AW-00; Tue, 26 Feb 2002 01:08:18 -0800 Message-ID: <3C7B5076.435E3B8@mindspring.com> Date: Tue, 26 Feb 2002 01:08:06 -0800 From: Terry Lambert X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony} (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: "Crist J. Clark" Cc: "Matthew D. Fuller" , "Jeremy C. Reed" , FreeBSD Chat Subject: Re: blocked mail References: <3C7AC400.B8F3E9FC@mindspring.com> <20020225174520.L47910@over-yonder.net> <3C7AEC08.223E422C@mindspring.com> <20020225224754.G52727@blossom.cjclark.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org "Crist J. Clark" wrote: > > Nevertheless, it's a common rule, and it used to be the > > default (it's called relay for MX) until the latest > > sendmail import; did you read Greg Shapiro's announcement > > on the changes? > > Pretty sure relay_based_on_MX has nothing to do with the sender, the > MAIL FROM. It checks the _recipient's,_ the RCPT TO, domain's MX > points to itself. There is no conflict if outgoing and incoming (which > is the one MX records point at) are not the same. I can't remember the "README" and M4 source code right now, but there is an option to permit a MAIL FROM check to make sure that the EHLO host (peername) is an MX for the from domain. Basically, if it can be checked, you should assume that someone is checking it. Weird-ass DNS setups that break the ability to check are expected to break, even if they are called out as legal in a proposed standard. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message