From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/36359 Path: main.gmane.org!not-for-mail From: Stainless Steel Rat Newsgroups: gmane.emacs.gnus.general Subject: Re: Sender header? Date: Thu, 24 May 2001 16:32:48 -0400 Organization: The Happy Fun Ball Brigade Message-ID: <01May24.163305edt.115259@gateway.intersys.com> References: <01May23.141128edt.115245@gateway.intersys.com> <01May24.115917edt.115250@gateway.intersys.com> <01May24.143521edt.115214@gateway.intersys.com> <01May24.153439edt.115213@gateway.intersys.com> NNTP-Posting-Host: coloc-standby.netfonds.no Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1035171958 8189 80.91.224.250 (21 Oct 2002 03:45:58 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 21 Oct 2002 03:45:58 +0000 (UTC) Return-Path: Original-Received: (qmail 28267 invoked by alias); 24 May 2001 20:33:24 -0000 Original-Received: (qmail 28262 invoked from network); 24 May 2001 20:33:23 -0000 Original-Received: from gateway.intersys.com (HELO intersys.com) (198.133.74.253) by gnus.org with SMTP; 24 May 2001 20:33:23 -0000 Original-Received: by gateway.intersys.com id <115259>; Thu, 24 May 2001 16:33:05 -0400 Original-To: "(ding)" X-Attribution: Rat In-Reply-To: User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Cuyahoga Valley) Original-Lines: 40 Xref: main.gmane.org gmane.emacs.gnus.general:36359 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:36359 * prj@po.cwru.edu (Paul Jarc) on Thu, 24 May 2001 | But your interpretation requires more than that. It's not enough just | to give random-sending-host.domain.com an MX record pointing to | mail.domain.com - mail.domain.com must also accept mail explicitly | addressed to random-sending-host.domain.com, even if it would | otherwise only accept mail addressed to domain.com itself, because you | would put random-sending-host.domain.com in Sender, and Sender must be | a mailbox of the person who sends the message. Yes, it should. In fact, it must. That is the nature of DNS. | Where does 2822 say that Sender must identify the host used to send | the mail? The canonical mailbox is required by RFC 2822. login @ FQDN is the most canonical name for any given user. | > Proper mail handling depends on that being the case. | What breaks when Sender does not identify the host the mail was sent | from? The correct question is, what breaks the Sender field does not canonically identify the sender? The answer is, if the Sender field does not contain the canonical mailbox of the sender and there is a problem, perhaps with that machine, I may be unable to contact the sender. You see, Sender is for human consumption only. It exists at least partially so that humans, like me, can track down problems at their source. If the Sender field does not include the FQDN of the sending host it makes finding and solving problems that much more difficult. | > If your host has neither A nor MX records then it is not configured | > correctly. | Right, but the A and MX records aren't the problem. Correct, they are the solution. -- Rat \ Happy Fun Ball contains a liquid core, Minion of Nathan - Nathan says Hi! \ which, if exposed due to rupture, should PGP Key: at a key server near you! \ not be touched, inhaled, or looked at.