Variable: gnus-group-posting-charset-alist
gnus-group-posting-charset-alist is a customizable variable defined in
gnus-msg.el.gz.
Value
(("^\\(no\\|fr\\)\\.[^,]*\\(,[ \n]*\\(no\\|fr\\)\\.[^,]*\\)*$"
iso-8859-1 (iso-8859-1))
("^\\(fido7\\|relcom\\)\\.[^,]*\\(,[ \n]*\\(fido7\\|relcom\\)\\.[^,]*\\)*$"
koi8-r (koi8-r))
(message-this-is-mail nil nil) (message-this-is-news nil t))
Documentation
Alist of regexps and permitted unencoded charsets for posting.
Each element of the alist has the form (TEST HEADER BODY-LIST), where TEST is either a regular expression matching the newsgroup header or a variable to query, HEADER is the charset which may be left unencoded in the header (nil means encode all charsets), BODY-LIST is a list of charsets which may be encoded using 8bit content-transfer encoding in the body, or one of the special values nil (always encode using quoted-printable) or t (always use 8bit).
Note that any value other than nil for HEADER infringes some RFCs, so use this option with care.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/gnus-msg.el.gz