Print in other languages from Mozilla MUA?

Hello SuSE folkz, My dad's using Mozilla as his MUA. He can read and write e-mail messages in German, English and Russian. However, when he tries to print any Inbox message in Russian or German the printed output looks like pseudo characters except headers. Though, he can print all e-mails in English without any problems. Could somebody please give me a hint how to fix this problem or what to check in configuration files. Many thanks in advance. Alex