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Date:   Tue, 14 Feb 2017 00:14:03 -0500
From:   Jeff King <peff@peff.net>
To:     Junio C Hamano <gitster@pobox.com>
Cc:     Arif Khokar <arif.i.khokar@gmail.com>,
        Johannes Schindelin <Johannes.Schindelin@gmx.de>,
        Arif Khokar <arif_khokar@hotmail.com>,
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        Eric Wong <e@80x24.org>
Subject: Re: Working with public-inbox.org [Was: [PATCH] rev-parse: respect
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On Mon, Feb 13, 2017 at 08:41:51PM -0800, Junio C Hamano wrote:

> Arif Khokar <arif.i.khokar@gmail.com> writes:
> 
> > One concern I have regarding this idea is whether or not SMTP servers
> > typically replace a Message-Id header set by the client.
> 
> The clients are supposed to give Message-IDs, but because some
> clients fail to do so, SMTP server implementations are allowed to
> add an ID to avoid leaving a message nameless (IIRC, 6.3 in
> RFC2821).  So "replace" would be in violation.
> 
> But some parts of the world ignore RFCs, so...

I know there are some terrible servers out there, but I think we can
discount any such server as horribly broken. Rewriting message-ids would
cause threading problems any time the sender referred to their own
messages. So "format-patch --thread" would fail to work, and even
replying to your own message from your "sent" folder would fail.

-Peff