From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/22964 Path: main.gmane.org!not-for-mail From: Tibor Simko Newsgroups: gmane.emacs.gnus.general Subject: Re: Message-ID Date: Wed, 12 May 1999 14:48:56 GMT Organization: CERN -- European Lab for Particle Physics Sender: owner-ding@hpc.uh.edu Message-ID: References: NNTP-Posting-Host: coloc-standby.netfonds.no Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: main.gmane.org 1035160786 31997 80.91.224.250 (21 Oct 2002 00:39:46 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 21 Oct 2002 00:39:46 +0000 (UTC) Return-Path: Original-Received: from farabi.math.uh.edu (farabi.math.uh.edu [129.7.128.57]) by sclp3.sclp.com (8.8.5/8.8.5) with ESMTP id KAA27012 for ; Wed, 12 May 1999 10:50:02 -0400 (EDT) Original-Received: from sina.hpc.uh.edu (lists@Sina.HPC.UH.EDU [129.7.3.5]) by farabi.math.uh.edu (8.9.1/8.9.1) with ESMTP id JAB19218; Wed, 12 May 1999 09:49:20 -0500 (CDT) Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Wed, 12 May 1999 09:49:59 -0500 (CDT) Original-Received: from sclp3.sclp.com (root@sclp3.sclp.com [204.252.123.139]) by sina.hpc.uh.edu (8.7.3/8.7.3) with ESMTP id JAA01881 for ; Wed, 12 May 1999 09:49:49 -0500 (CDT) Original-Received: from sunsite.auc.dk (sunsite.auc.dk [130.225.51.30]) by sclp3.sclp.com (8.8.5/8.8.5) with SMTP id KAA27005 for ; Wed, 12 May 1999 10:49:39 -0400 (EDT) Original-Received: (qmail 11673 invoked by uid 509); 12 May 1999 14:48:57 -0000 Original-To: ding@gnus.org Original-Path: not-for-mail Original-Newsgroups: emacs.ding Original-Lines: 33 User-Agent: Gnus/5.070083 (Pterodactyl Gnus v0.83) XEmacs/20.4 (Emerald) Original-NNTP-Posting-Host: 137.138.115.106 Original-X-Complaints-To: news@sunsite.auc.dk Original-X-Trace: sunsite.auc.dk 926520536 137.138.115.106 (Wed, 12 May 1999 16:48:56 MET DST) Original-NNTP-Posting-Date: Wed, 12 May 1999 16:48:56 MET DST Precedence: list X-Majordomo: 1.94.jlt7 Xref: main.gmane.org gmane.emacs.gnus.general:22964 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:22964 >>>>> "FW" == Florian Weimer writes: FW> You don't need to have a DNS entry for the FQDN, but it's FW> better if there's an MX record (for mail delivery). [...] Of FW> course, the FQDN must be from a name space under your control, FW> otherwise you can't guarantee the uniqness of the message IDs FW> (which is required for news articles). What about the following situation. I'm using PPP with dynamic IP. While offline I'm posting to a local queue which is flushed once the PPP connection is on. * stage #1: At the moment of posting, FQDN is junk-name.isp.com since PPP is off. No DNS entry exists for junk-name.isp.com. It seems impossible to assure the uniqueness of Message-ID since someone may very well choose the very same junk-name, post at the very same time, using the very same uid, MUA, etc, etc. * stage #2: At the moment of sending the message to ISP, FQDN is dynamic-name-isp-gives-me.isp.com, which is a DNS-happy name. Good, but it is too late to create Message-ID since the post has already been queued before. Since Message-ID attribution already happened, it does not seem to be a good idea to rewrite it with the new hostname, for several reasons; e.g. someone could have used it while I typed my message off-line so we may find the same uniqueness problem as described above. Should the Message-ID creation be left completely to the ISP level and not dealt with locally at all, neither by MUA nor MTA? Tibor -- Premature optimization is the root of all evil.  --Donald E Knuth