From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/36355 Path: main.gmane.org!not-for-mail From: prj@po.cwru.edu (Paul Jarc) Newsgroups: gmane.emacs.gnus.general Subject: Re: Sender header? Date: 24 May 2001 15:52:59 -0400 Sender: prj@multivac.cwru.edu Message-ID: 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 1035171954 8170 80.91.224.250 (21 Oct 2002 03:45:54 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 21 Oct 2002 03:45:54 +0000 (UTC) Return-Path: Original-Received: (qmail 27674 invoked by alias); 24 May 2001 19:53:00 -0000 Original-Received: (qmail 27669 invoked from network); 24 May 2001 19:52:59 -0000 Original-Received: from multivac.student.cwru.edu (HELO multivac.cwru.edu) (261@129.22.96.25) by gnus.org with SMTP; 24 May 2001 19:52:59 -0000 Original-Received: (qmail 26183 invoked by uid 500); 24 May 2001 19:53:21 -0000 Mail-Followup-To: ding@gnus.org Original-To: "\(ding\)" In-Reply-To: <01May24.153439edt.115213@gateway.intersys.com> (Stainless Steel Rat's message of "Thu, 24 May 2001 15:34:23 -0400") User-Agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/20.7 Original-Lines: 36 Xref: main.gmane.org gmane.emacs.gnus.general:36355 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:36355 Stainless Steel Rat writes: > * prj@po.cwru.edu (Paul Jarc) on Thu, 24 May 2001 >| By your interpretation, the RFC is requiring that every machine that >| sends mail must be usable in a recipient address - i.e., the MX (or A) >| for that name must be configured to accept mail addressed to that >| individual host. (Otherwise, user-login-name@system-name wouldn't be >| a mailbox of the originator of the message.) Do you think the authors >| really intended to require this? > > Yes, that is exactly what I think. A records are required for all machines > on the Internet that have anything to do with mail, and MX records should > exist for all such hosts. 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. Where does 2822 say that Sender must identify the host used to send the mail? > Proper mail handling depends on that being the case. What breaks when Sender does not identify the host the mail was sent from? > 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. paul