diff --git a/emacs.d/mail.org b/emacs.d/mail.org
index be85098..1cb726b 100644
--- a/emacs.d/mail.org
+++ b/emacs.d/mail.org
@@ -227,6 +227,14 @@ These functions may be buggy; I seldom use them.
     (gnus-import-patch-set repo-path t))
 #+END_SRC
 
+*** Signing and Encrypting
+Every message I sent is cryptographically signed using my GPG key.  When I
+have my recipients' keys, they're also encrypted.
+
+BEGIN_SRC emacs-lisp
+  (setq mml-secure-openpgp-signers t)
+#+END_SRC
+
 *** Archiving
 I archive my sent messages to both reference and reflect upon what I
 have said.  But I don't want to feel obligated to re-read what I