Re: [Emacs-diffs] /srv/bzr/emacs/trunk r104691: Don't reuse previous Message-id when resending.

[Uday S Reddy]

On 6/27/2011 5:28 PM, Richard Stallman wrote:

> I cannot follow that concretely.  However, it is perfectly normal to
> write multiple responses to a single incoming message.  Retrying the
> first response with a new Message-ID is a special case of that, so it
> can't be wrong.  I am confident that any programs designed to keep
> track of threads do something reasonable in this case.

Something "reasonable" can be done.  But I don't think it is ideal.

If there are two copies of the same message in the mail folder with 
different Message-ID's, then some responses would get threaded under one 
copy and the others under the other copy, causing confusion.  If the 
user happens to delete one of the copies, since it is logically a 
duplicate, then the responses threaded under it would get messed up.

On the other hand, I know from experience that dealing with duplicate 
copies of messages is surprisingly tricky.  So, I can sympathize with 
the problems of mail client developers, and not being able to handle 
duplicate copies with different dates.

Hopefully, this doesn't happen too often.

Cheers,
Uday