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From: David Kastrup <dak@gnu.org>
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Subject: Re: Emacs removes whitespaces at the end of lines
Date: Sun, 02 Aug 2009 18:22:18 +0200
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"F. Unglaub" <f.unglaub@gmail.com> writes:

> Hello,
>
> I use emacs with mutt and slrn (post-mode) and noticed that
> whitespaces at the end of lines are auto-removed. This leads to
> problems, for example, with the signature delimiter "-- \n". In my
> case it's reduced to "--\n" which certain newsreaders like tin
> consider wrong.
>
> Also those unused headers should have the trailing whitespace IIRC
> (for example Summary, Keywords etc.).
>
> Is there any setting that can circumvent this issue?

It is not the default, so you have something in your .emacs or other
customizations that does this.

-- 
David Kastrup