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-rw-r--r--lisp/mail/smtpmail.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index d356979ea26..7e6d4746e8d 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -523,7 +523,7 @@ This is relative to `smtpmail-queue-dir'.")
(when (and cred mech)
(cond
((eq mech 'cram-md5)
- (smtpmail-send-command process (format "AUTH %s" mech))
+ (smtpmail-send-command process (upcase (format "AUTH %s" mech)))
(if (or (null (car (setq ret (smtpmail-read-response process))))
(not (integerp (car ret)))
(>= (car ret) 400))