+- mhbuild(1) now is automatically run by send, to insure that all outgoing
+ messages have proper MIME formatting.
+- A new header, "Attach", is supported by mhbuild; it is used to replace
+ previous functionality (which by default used a header named
+ Nmh-Attachment).
+- The default Content-Transfer-Encoding for text parts is now 8bit.
+- mhbuild(1) now supports a selectable Content-Transfer-Encoding