Original von DJ-Achtung
All of KDE, including Kopete is set up according to your ~/.login_conf file. In it, you have to set your language and the encoding to whatever you desire, like cp1251. If you wish M$ users to see what you type - your ~/.login_conf file should look something like:
me:My Account:\
:charset=KOI8-R:\
:lang=ru_RU.cp1251:
Try that.
@DJ-Achtung: Are you, by any chance, using FreeBSD?
On Linux, I've not heard of that config file yet and google is full of FreeBSD hits for ".login_conf". I may be wrong though...