(smtpmail-warn-about-unknown-extensions): Add :version.

fa87f673 · Gerd Moellmann · 1b62b062 · fa87f673
Commit fa87f673 authored May 07, 2001 by Gerd Moellmann
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lisp/mail/smtpmail.el lisp/mail/smtpmail.el +1 -0

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--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -126,6 +126,7 @@ and sent with `smtpmail-send-queued-mail'."
 This is mainly useful for development purposes, to learn about
 new SMTP extensions that might be useful to support."
  :type 'boolean
+  :version "21.1"
  :group 'smtpmail)

 (defvar smtpmail-queue-index-file "index"