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From: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =?iso-8859-1?q?Gro=DFjohann?=)
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Subject: Re: `user-mail-address' for message-ids
Date: 24 Feb 2001 13:08:11 +0100
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Original-To: "Jason R. Mastaler" <jason@mastaler.com>
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On 23 Feb 2001, Jason R. Mastaler wrote:

> No.  Many MUAs use the user's chosen e-mail address (such as Mutt)
> in the message-id instead of the system's fqdn.  I say that if the
> 1st half of the message-id (before the "@") doesn't guarantee
> uniqueness, then we need to rethink the algorithm for
> `message-make-message-id'.

No no no.  Consider people with a gnu.org address, or acm.org, or
hotmail.com.  People who use the default Linux installation will
probably be using an account with the user id 100 (or was it 1000?),
so the user id part that goes into the local part of the message id
doesn't help, either.

You MUST use a rhs part for the msg id which uniquely identifies the
computer you're sitting at.

Savvy ISPs provide a rhs for their dialup customers -- the rhs doesn't
have to be a valid hostname, so something like
<login>.dialup.<provider>.net would do nicely.

kai
-- 
Be indiscrete.  Do it continuously.