chance something needs to be adapted in the mailcap configuration.
For Example: The `copiousoutput` setting in mailcap files needs to be
-removed for some mime-types to prevent immediate removal of tempory
+removed for some mime-types to prevent immediate removal of temporary
files so the configured viewer can access them.
(add-hook 'notmuch-show-markup-headers-hook 'notmuch-show-subject-tabs-to-spaces)
-And in header lines (this will only work with the yet to be released
-notmuch version 0.15):
+And in header lines:
(defun notmuch-show-header-tabs-to-spaces ()
"Replace tabs with spaces in header line."