diff --git a/config.org b/config.org
index d4ff4bd..bf184b5 100644
--- a/config.org
+++ b/config.org
@@ -622,7 +622,7 @@ needs to be set up to install them if they aren't already.
   And to avoid being tickled:
 
   #+begin_src emacs-lisp
-    (setq mail-host-address "hactar")
+    (setq mail-host-address (shell-command-to-string "hostname"))
   #+end_src
 
 ** Automatic updating