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From: "Stefan Monnier" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu>
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Subject: Re: howto suffix based fill-column?
Date: 10 Aug 2003 14:07:05 -0400
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>>>>> "Eike" == Eike Kroemer <kroemer@atlas.de> writes:
> can someone kind provide me with some code for my .emacs that will do
> the following:

> if (suffix-of-file == eml)
>   enter text mode
>   (setq fill-column 68)
> else
>   (setq fill-column 79)
> end

   (define-derived-mode eml-mode text-mode "EML"
     "Mode for EML files."
     ;; Add more EML-specific settings here.
     (set (make-local-variable 'fill-column) 68))
   
   ;; Make .eml files use eml-mode.
   (add-to-list 'auto-mode-alist '("\\.eml\\'" . eml-mode))

To set the rest to 79 column, try something like

   (setq-default fill-column 79)


        Stefan