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 changed to nil.
+** The default for message-forward-show-mml changed to symbol best.
-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.
+The behaviour for the `best' value is to show MML (i.e., convert MIME
+to MML) when appropriate. MML will not be used when forwarding signed
+or encrypted messages, as the conversion invalidate the digital
+signature.
** Bug fixes.