Add plantuml and some new emacs mail settings

emacs/.config/doom/config.el

@@ -85,8 +85,10 @@
         :desc "Switch themes"           "t" #'load-theme)
       (:prefix "o"
         :desc "Elfeed feed reader"      "f" #'elfeed)
+      (:prefix "o"
+        :desc "Compose an email"        "c" #'notmuch-mua-new-mail)
       (:prefix "b"
-        :desc "Black format buffer"            "f" #'blacken-buffer)
+        :desc "Black format buffer"     "f" #'blacken-buffer)
       (:prefix "/"
         :desc "Search the web"          "w" #'web-search)
       (:prefix "y"
@@ -115,8 +117,9 @@
 
 ;; app/rss
 (add-hook! 'elfeed-show-mode-hook (text-scale-set 1.5))
-(setq rmh-elfeed-org-files (list "~/org/elfeed.org"))
-(setq elfeed-search-filter "@1-week-ago +unread ")
+
+(setq rmh-elfeed-org-files (list "~/org/elfeed.org")
+      elfeed-search-filter "@1-week-ago +unread ")
 
 ;; emacs/eshell
 (after! eshell
@@ -136,9 +139,12 @@
 (setq send-mail-function 'sendmail-send-it
       sendmail-program "/usr/local/bin/msmtp"
       mail-specify-envelope-from t
+      message-sendmail-f-is-evil t
       message-sendmail-envelope-from 'header
+      message-sendmail-extra-arguments '("--read-envelope-from")
       mail-envelope-from 'header)
 
+(add-to-list 'auto-mode-alist '("\\.plantuml\\'" . planetuml-mode))
 
 (load! "+ui.el")
 (load! "+org")      ;; Org mode stuff like todos and rebindings