Re: Recognize mbox files?

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Mon, 09 Feb 2009 20:34:27 -0500
> Cc: Chong Yidong <address@hidden>, address@hidden, address@hidden
> 
> 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.