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From: prj@po.cwru.edu (Paul Jarc)
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Subject: Re: `user-mail-address' for message-ids
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"Jason R. Mastaler" <jason@mastaler.com> writes:
> Per Abrahamsen <abraham@dina.kvl.dk> writes:
> > Yes.  It would increase the risk of duplicate message ids, i.e. all
> > the users of all the machines in our department share the
> > 'dina.kvl.dk' mail host name, but I'm the only one using ssv2.
> 
> By this argument, using (system-name) for the message-id doesn't
> insure uniqueness.

It ensures that this Message-ID won't be the same as any Message-ID
produced on another correctly configured system; this is exactly what
the use of (system-name) is intended to guarantee.

> In your case you are the only one using ssv2, but consider large
> multiuser servers where hundreds of gnus users may be using the same
> machine.

Gnus puts the username in the Message-ID, so this shouldn't be a
problem.  Still, I certainly wouldn't mind if (emacs-pid) were added
into the mix as well.


paul