Charset problem!

[Dmitry Sidorov <sidr @ sidora . net>]

I have some text with charset koi8-r in the subject_prefix prarmeter
in mylist.config file.
But some messages sent to this mailing list have subject in difrent
(not koi8-r) charsets. Becose of that all recipiens have had bad
text in subject string. Some text is in koi8-r charset and some is
in other. This is very bad for me. How can I win this problem?