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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Recognize mbox files?
Date: Tue, 10 Feb 2009 11:36:03 +0200
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 09 Feb 2009 20:34:27 -0500
> Cc: Chong Yidong <cyd@stupidchicken.com>, rms@gnu.org, emacs-devel@gnu.org
> 
> It's important that if opened on a non-mbox file, Rmail shouldn't do
> anything bad (e.g. it shouldn't modify the file).

This could be impossible: it could be a while before Rmail detects
that a file isn't an mbox file.  By that time, it could have already
modified some of it.