email: Encode the body when we might use 8bit encoding

email: Encode the body when we might use 8bit encoding

R. David Murray writes [1]:
> In 2.x that will work, and will give you the 8bit CTE at need, as
> long as you pass encoded text to MIMEText (as opposed to
> unicode...which it doesn't really handle correctly if I recall
> right).

See also, [2].

[1]: http://bugs.python.org/issue12552
     email.MIMEText overide BASE64 for utf8 charset
[2]: http://bugs.python.org/issue12553
     Add support for using a default CTE of '8bit' to MIMEText

Signed-off-by: W. Trevor King <wking@tremily.us>