Merge from origin/emacs-28

ea44d7ddfc ; * lisp/mail/smtpmail.el (smtpmail-via-smtp): Explain wit...

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index fcb072d5d09..45b25b55301 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -806,7 +806,11 @@ Returns an error if the server cannot be contacted."
                                 (plist-get (cdr result) :capabilities)
                                 "\r\n")))
                   (let ((name
-                         (with-case-table ascii-case-table ;FIXME: Why?
+                         ;; Use ASCII case-table to prevent I
+                         ;; downcasing to a dotless i under some
+                         ;; language environments.  See
+                         ;; https://lists.gnu.org/archive/html/emacs-devel/2007-03/msg01760.html.
+                         (with-case-table ascii-case-table
                            (mapcar (lambda (s) (intern (downcase s)))
                                    (split-string (substring line 4) "[ ]")))))
                     (when (= (length name) 1)