# Encrypt connection to SMTP server.
smtptls
-# Sign bug reports using gnupg.
+# Sign bug reports using GnuPG. Ignored when a MUA (like mutt) is used.
sign gpg
+
+# Display complete mail before sending it. Not used with mutt.
+paranoid
+
+# Use mutt as MUA to send the mails.
+mutt
+# And use mutt to read mboxes.
+mbox_reader_cmd "mutt -f %s"