>>>>> In <1149691274.093917.171800@i39g2000cwa.googlegroups.com>
>>>>>	codebuger@gmail.com wrote:

> Thank you, but it doesn't work for me :(

Hmm, how is your message encoded?  I guess the reason the
encoding failed is one of them:

1. You hadn't opened the summary buffer of the group to which
   you were about to post a message then.  Note that the
   following group parameter is effective only when the summary
   buffer of a fido7 newsgroup is opened or just after closing
   that summary buffer, for instance.

--8<---------------cut here---------------start------------->8---
;; Prefer `koi8-r' in the fido7 hierarchy.
(add-to-list
 'gnus-parameters
 '("\\`fido7\\."
   (mm-coding-system-priorities '(koi8-r iso-8859-1 utf-8))))
--8<---------------cut here---------------end--------------->8---

2. If a message contains Russian text and Ukrainian text, though
   it is unlikely, it cannot be encoded with the koi8-r charset.

3. You crossposted a message to groups including groups which
   weren't specified by `gnus-group-posting-charset-alist'.

I attached a message that I've posted to the fido7.testing group
with the following configuration in my ~/.gnus.el file:

--8<---------------cut here---------------start------------->8---
;; Set the default value of `mm-coding-system-priorities' which is
;; suitable for the Japanese language environment.
(eval-after-load "gnus-sum"
  '(add-to-list
    'gnus-newsgroup-variables
    '(mm-coding-system-priorities
      . '(iso-8859-1 iso-2022-jp iso-2022-jp-2 shift_jis utf-8))))

;; Prefer `koi8-r' in the fido7 hierarchy.
(add-to-list
 'gnus-parameters
 '("\\`fido7\\."
   (mm-coding-system-priorities '(koi8-r iso-8859-1 utf-8))))
--8<---------------cut here---------------end--------------->8---