         message-sendmail-extra-arguments '("--read-envelope-from")
         sendmail-program "msmtp")
 
-  ;; Allow for fetch mail and update index using 'U' in the main view
+  ;; Allow mu4e to fetch mail and update index
   ;; NOTE: I use own cron/shell task to get/sync email
   (setq mu4e-get-mail-command "true")
   ;; Get mail and update index periodically in the background (unit: seconds)

  ;; change the luminosity form dark theme
  (setq shr-color-visible-luminance-min 70)

  ;; add custom bookmarks
  (setq mu4e-bookmarks
        '(("flag:unread AND NOT flag:trashed" "Unread messages"      ?u)
          ("flag:draft"                       "Drafts"               ?f)
          ("tag:todo OR tag:task"             "TODO / Task"          ?t)
          ("tag:work"                         "Work"                 ?W)

  ;; exclude the duplicate messages with the same `Message-ID'
  ;(setq mu4e-headers-skip-duplicates t)

  ;; Customize the reply/quote citation format
  (setq message-citation-line-format "On %a, %Y-%b-%d at %R %Z, %f wrote:\n")
  ;; Choose to use the above formatted string
  (setq message-citation-line-function 'message-insert-formatted-citation-line)

  ;; confirm before sending
