Hi,

i'm using Gnus v5.10.2 from CVS

i have set the default charset for reading messages in
gnus-group-charset-alist to koi8-r instead of iso-8859-1:

(eval-after-load "gnus-sum"
  '(setq gnus-group-charset-alist
     (append (delete '(".*" iso-8859-1) gnus-group-charset-alist)
	'((".*" koi8-r)))))

this works most of the time but fails for some articles.

i've attached the message for which gnus shows iso-8859-1 in the body,
instead of koi8-r. i think that gnus somehow tries to detect the
charset of the message body (and the body contains some character
unencodable in koi8-r which makes it think that this is iso-8859-1),
which it should not do if there's no charset specified in
content-type, and it should use the values specified in
gnus-group-charset-alist (and maybe others).

Best,
v.