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From: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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Subject: Re: [Announce] Mine game v1.17 for Emacs
Date: 31 Jan 1997 23:23:38 +0100
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References: <qk2n2tqe1f2.fsf@iptsun2.unil.ch> <199701310720.CAA00587@psilocin.gnu.ai.mit.edu> <199701310936.EAA01473@psilocin.gnu.ai.mit.edu> <qk2bua6dtxg.fsf@iptsun2.unil.ch>
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Cc: Richard Stallman <rms@gnu.ai.mit.edu>
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Wes Hardaker <Wesley.Hardaker@sphys.unil.ch> writes:

> >>>>> "RS" == Richard Stallman <rms@gnu.ai.mit.edu> writes:
> 
> RS> Is it desirable to make both an In-reply-to and a References
> RS> referring to the same message?
> 
> Yes, I believe so...  Well...  actually I'm not possitive.  I'd ask
> Lars or read the RFCs to be sure.  I doubt it would hurt.

The References header has a strictly defined syntax (defined by
RFC1036 for news, but is used by most mail agents as well) and is
therefore usable for building threads.  There is no syntax
specification of the In-Reply-To header.

Here are the two headers from Wes' article:

References: <qk2n2tqe1f2.fsf@iptsun2.unil.ch>,
            <199701310720.CAA00587@psilocin.gnu.ai.mit.edu> <199701310936.EAA01473@psilocin.gnu.ai.mit.edu>
In-Reply-To: Richard Stallman's message of Fri, 31 Jan 1997 04:36:21 -0500

(The References header is malformed, by the way -- there should be no
comma after the first Message-ID.)

Having the References header is vital, while the In-Reply-To header
carries some informal information which might be nice to have.

-- 
(domestic pets only, the antidote for overdose, milk.)
  larsi@ifi.uio.no * Lars Ingebrigtsen