When I write a long line while composing a mail in mu4e, the lines are truncated for viewing (toggle-truncate-lines), but as soon as I hit Enter fixed line breaks (column width seems to be 70 or something) are introduced.

How can I stop mu4e from introducing these line breaks?

2 Answers 2


You can turn off auto-fill-mode in the mu4e message buffer. You can do so automatically by adding a function to the mu4e-compose-mode-hook:

(defun no-auto-fill ()
  "Turn off auto-fill-mode."
  (auto-fill-mode -1))

(add-hook 'mu4e-compose-mode-hook #'no-auto-fill)

This will suffice in emacs nowadays:

(add-hook 'mu4e-compose-mode-hook 'turn-off-auto-fill)
  • 4
    I like to combine this with (add-hook 'mu4e-compose-mode-hook 'visual-line-mode) to have 'soft' line wrapping without actual newlines, but ensuting that the text stays inside my frame.
    – AstroFloyd
    Commented May 20, 2019 at 16:47

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