Graham Todd writes:

> [...] I think it was decided that if roughly 1/6 of the characters
> were non-ASCII, then base64 should be used otherwise Q/P [...] most
> PDF's would/should get encoded as base64 wouldn't they?  Anyway they
> appear ASCIIish to Gnus.

There is a bug in the function that chooses between quoted printable
and base64.  The following patch should fix it.

Kim-Minh.