Mail composer (also libmime) uses utf-8 for internal processing. Cata said it's ready for the check in. Entering a bug in order to keep track of the dependency.
Changed to P1 - needed for M4.
UTF-8 encoder is also needed by libmime for viewing messages.
** Checked with 4/8/99 evening build for Win32 ** Given that Latin1 high-bit range characters shown and sent correctly and also that ISO-2022=JP headers are displayed correctly, it seems that UTF-8 encoder is working. I'm going to mark the fix verified.