This change was made to avoid conflict with the standard binding of
`back-to-indentation', which is also useful in message mode.
+** The default for message-forward-show-mml change to nil.
+
+The reason is that decoding MIME, showing MML, and later re-encode the
+MIME does not work properly for, e.g., PGP/MIME signed messages.
+
** Bug fixes.
\f