--- a/mail.rst	Fri Mar 05 19:53:43 2010 +0200
+++ b/mail.rst	Sun Mar 07 12:39:42 2010 +0200
@@ -1,5 +1,12 @@
 -*- outline -*-
 
+* Message headers fields.
+
+  http://tools.ietf.org/rfc/rfc2822.txt
+                 Internet Message Format
+  http://tools.ietf.org/rfc/rfc2821.txt
+                 Simple Mail Transfer Protocol
+
 * Sending email via gmail in emacs.
 
 ; install starttls from here (no need for patch)