1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index 78688d170cc..e30c69f2441 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -1057,8 +1057,8 @@ Returns an error if the server cannot be contacted."
     (while data-continue
       (with-current-buffer buffer
         (progress-reporter-update pr (point))
-        (setq sending-data (buffer-substring (line-beginning-position)
-                                             (line-end-position)))
+        (setq sending-data (buffer-substring-no-properties (line-beginning-position)
+                                                           (line-end-position)))
         (end-of-line 2)
         (setq data-continue (not (eobp))))
       (smtpmail-send-data-1 process sending-data))