Include "Date:" in mail messages filed by 'sendmail-send-it'

* lisp/mail/sendmail.el (mail-do-fcc): Insert a 'Date:' header
into the filed message.  In the outgoing message, sendmail will
add the date, but the composed message body doesn't have it.
(Bug#25436)

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index 690825bf1e5..70c8ea1f937 100644
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -28,8 +28,8 @@
 
 ;;; Code:
 (require 'mail-utils)
-
 (require 'rfc2047)
+(autoload 'message-make-date "message")
 
 (defgroup sendmail nil
   "Mail sending commands for Emacs."
@@ -1409,6 +1409,7 @@ just append to the file, in Babyl format if necessary."
         (require 'mail-utils)
         (insert (mail-rfc822-time-zone time) " ")
         (goto-char (point-max))
+        (insert "Date: " (message-make-date) "\n")
         (insert-buffer-substring mailbuf)
         ;; Make sure messages are separated.
         (goto-char (point-max))