[MlMt] Transfer encoding of signed text parts

[Alan Egerton]

Just trialling (and *loving*) MailMate at present, but have a small
niggling irritation when sending (S/MIME) signed messages: the text part
is then always sent with quoted-printable transfer encoding, whereas the
same message if unsigned is sent with default/7bit transfer encoding.

Is there any way to change this behaviour so that signed messages
continue using 7bit transfer encoding (where possible)?

Thanks--and keep up the awesome work!

-- Alan