UTF symbols in mail subject

[demon101]

After sending via java client Mail title is “Angebot für einen...“, but should be “Angebot für einen....“.
In same mail html body shown well
Sending by curl working right

[demon101]

I think, problem in method encodeAccentedCharactersFromMessage

private void encodeAccentedCharactersFromMessage(PostalMessage message) {
        if (message.getHtmlBody() != null) {
            message.setHtmlBody(StringEscapeUtils.encodeHtml(message.getHtmlBody()));
        }
        if (message.getPlainBody() != null) {
            message.setPlainBody(StringEscapeUtils.encodeHtml(message.getPlainBody()));
        }
        if (message.getSubject() != null) {
            message.setSubject(StringEscapeUtils.encodeHtml(message.getSubject()));
        }
    }

subject (and plain body???) non necessary to encode as HTML