* wl-message.el (wl-message-display-internal): Bind `default-mime-charset'.

* wl-message.el (wl-message-display-internal): Bind `default-mime-charset'.

* wl-fldmgr.el (wl-fldmgr-make-group): Check folder name error.

* wl-draft.el (wl-draft-reply): Decode newsgroup field.

* elmo.el (elmo-make-folder): Add folder name error check.

* elmo-nntp.el (elmo-nntp-group-coding-system): New variable.
(elmo-nntp-encode-group-string): New inline function.
(elmo-nntp-decode-group-string): Ditto.
(elmo-folder-initialize): Use elmo-nntp-encode-group-string.
(elmo-nntp-folder-list-subfolders): Set processing buffer as unibyte;
Use `not' instead of `null';
Use elmo-nntp-decode-group-string.

* elmo-imap4.el (elmo-folder-list-subfolders): Don't append delimiter.