emacs 24 required for some smtpmail features

diff --git a/emacstips.mdwn b/emacstips.mdwn
index f6df9f6fc57d7b7fa354e36a203aa9ed30d73464..2b0b1d54f30300b8f29ec2dafc0b249009d50abb 100644 (file)
--- a/emacstips.mdwn
+++ b/emacstips.mdwn
@@ -308,6 +308,9 @@ SMTP server via TCP connection. It is pretty easy to configure:
         ;;    smtpmail-debug-verb t
               message-send-mail-function 'message-smtpmail-send-it)
 
+Note that emacs 24 or newer is required for `smtpmail-stream-type`
+(and smtp authentication) to be effective.
+
 More information for smtpmail is available:
 
 * In Emacs: `M-x info-display-manual smtpmail`