$ diff -u /home/dpm/.local/share/applications/dekko.desktop /usr/share/applications/dekko.desktop
--- /home/dpm/.local/share/applications/dekko.desktop	2015-07-02 22:58:54.000000000 +0200
+++ /usr/share/applications/dekko.desktop	2016-03-18 18:20:36.197182965 +0100
@@ -5,7 +5,7 @@
 X-Ubuntu-Touch=true
 Name=Dekko
 Keywords=mail;e-mail;IMAP;SMTP;eml;MUA;
-Exec=dekko
-Icon=dekko.png
+Exec=dekko %U
+Icon=dekko
+MimeType=x-scheme-handler/mailto;application/dekko;x-scheme-handler/dekko;
 X-Ubuntu-Splash-Color=#F5F5F5
-X-Ubuntu-Supported-Orientations=portrait