Logged In: YES 
user_id=8719

i am sorry, i do not think that charset guessing as in
attached patch is the right thing.  if charset must be
specified, it should be explicitely set in file mime type
(you can use database detectors to apply site defaults).

commited in the HEAD branch (will appear in 0.9) is a fix
that checks if text/plain attachment can be 7bit-encoded,
and uses quoted printable encoding if it cannot.