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Message-Id: <v04205132b379e0128e28@[195.238.1.121]>
In-Reply-To: <01D6C7224936D211BA450000F805D53805421679@TOTO>
References: <01D6C7224936D211BA450000F805D53805421679@TOTO>
Date: Tue, 1 Jun 1999 21:10:41 +0200
To: "Larry Osterman (Exchange)" <larryo@exchange.microsoft.com>,
        "'Matt Curtin'" <cmcurtin@interhack.net>
From: Brad Knowles <blk@skynet.be>
Subject: RE: Take 2: References/In-Reply-To replacement text
Cc: "'Robert Elz'" <kre@munnari.oz.au>, Pete Resnick <presnick@qualcomm.com>,
        DRUMS <drums@cs.utk.edu>
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At 11:46 AM -0700 6/1/99, Larry Osterman (Exchange) wrote:

> Anyway, as to your comment about the RHS of the @ in a mesage ID being
> required to be a FQDN.  I don't understand this requirement at all.  It
> seems to me that it would be a significant modification of the RFC822
> grammar, and I can't see any technical requirements for it.

	Because there might be hundreds or thousands or even millions of 
machines out there named "toto", and there's a non-zero probability 
that one or more of them might have a different scheme of generating 
message-ids that could manage to collide with your scheme, unless you 
make the RHS sufficiently unique.

	I.e., you put on the machines FQDN, IP address, or something else 
that is pretty much guaranteed to be unique to that particular 
machine out of all others in the Universe -- and not just based on 
the grounds of probability, so don't even think about something like 
generating a "random" 128 bit quantity and appending that.

-- 
   These are my opinions -- not to be taken as official Skynet policy
  ____________________________________________________________________
|o| Brad Knowles, <blk@skynet.be>            Belgacom Skynet NV/SA |o|
|o| Systems Architect, News & FTP Admin      Rue Col. Bourg, 124   |o|
|o| Phone/Fax: +32-2-706.11.11/12.49         B-1140 Brussels       |o|
|o| http://www.skynet.be                     Belgium               |o|
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
  Unix is like a wigwam -- no Gates, no Windows, and an Apache inside.
   Unix is very user-friendly.  It's just picky who its friends are.