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Configuration: Subject check

Before sending a message, signal an error 

if the subject line is empty (23).

(with-eval-after-load 'notmuch
  (add-hook 'notmuch-mua-send-hook
            #'notmuch-mua-subject-check))

Footnotes

(23)

“Is empty” as per the notmuch-mua-subject-regexp.

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