Encoding of asian characters + accented characters in email subject doesn't seem to work properly

Encoding of asian characters + accented characters in email subject doesn't seem to work properly (e.g. àáâãäåçèéêëìíîðñòôõöö国際交流基金海外運営専門

came out as �焔褐刻諮蒼樗?迄剱囹???????????? in the email subject