+- mhfixmsg now replaces RFC 2047 encoding with RFC 2231 encoding of name and
+ filename parameters in Content-Type and Content-Disposition headers,
+ respectively.
+- If a message body contains 8-bit bytes, post(8) uses SMTP 8BITMIME if the
+ server supports it. If not, post fails with a message to the user to
+ encode the message for 7-bit transport.