Use Emacs as a mailto: handler

.local/bin/emacs-mail

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+emacsclient -c --eval "(browse-url-mail \"$@\")"

.local/share/applications/emacs-mail.desktop

@@ -0,0 +1,6 @@
+[Desktop Entry]
+Name=Emacs Mail
+Comment=E-Mail client
+Exec=emacs-mail %u
+MimeType=x-scheme-handler/mailto;
+Type=Application

.xprofile

@@ -19,6 +19,7 @@ text/html=$BROWSER.desktop
 application/pdf=zathura.desktop
 x-scheme-handler/http=$BROWSER.desktop
 x-scheme-handler/https=$BROWSER.desktop
+x-scheme-handler/mailto=emacs-mail.desktop
 EOF
 
 ## X resources for xterm.