Variable: imap-use-utf7
imap-use-utf7 is a customizable variable defined in imap.el.gz.
Value
t
Documentation
If non-nil, do utf7 encoding/decoding of mailbox names.
Since the UTF7 decoding currently only decodes into ISO-8859-1 characters, you may disable this decoding if you need to access UTF7 encoded mailboxes which doesn't translate into ISO-8859-1.
Source Code
;; Defined in /usr/src/emacs/lisp/net/imap.el.gz
(defcustom imap-use-utf7 t
"If non-nil, do utf7 encoding/decoding of mailbox names.
Since the UTF7 decoding currently only decodes into ISO-8859-1
characters, you may disable this decoding if you need to access UTF7
encoded mailboxes which doesn't translate into ISO-8859-1."
:type 'boolean)