emacs-21.3.50 で JISX0201 カタカナが入ったメールを送信しようとすると、
↓みたいになっちゃう〜。

Debugger entered--Lisp error: (error "Multibyte character in data for base64 encoding")
base64(141 175)
mime-encode-region(141 175 "base64")
mime-edit-normalize-body()
mime-edit-translate-region(105 135 "Multipart_Wed_Dec__3_13:55:09_2003-1")
mime-edit-translate-body()
(save-excursion (mime-edit-pgp-enclose-buffer) (mime-edit-translate-body))
(catch (quote mime-edit-error) (save-excursion (mime-edit-pgp-enclose-buffer) (mime-edit-translate-body)))
(if (catch (quote mime-edit-error) (save-excursion ... ...)) (error "Translation error!"))
(progn (let (...) (setq mime-edit-pgp-processing pgp-processing)) (run-hooks (quote mime-edit-translate-hook)) (if (catch ... ...) (error "Translation error!")) (run-hooks (quote mime-edit-exit-hook)))