private void sendMessageWithCharset(
            final String from,
            final String subject,
            final String body,
            final String to,
            final String charset) throws MessagingException {
        final Properties mailProps = this.getMailProperties(smtpServer.getPort());
        final Session session = Session.getInstance(mailProps, null);
        final MimeMessage msg = this.createMessageWithCharset(session, from, to, subject, body, charset);
        Transport.send(msg);
    }
See
<a href="http://sourceforge.net/tracker/index.php?func=detail&amp;aid=1474700&amp;group_id=78413&amp;atid=553186">...</a>
for discussion about this bug

@throws IOException        on IO error
@throws MessagingException on messaging error
src/test/java/de/gessnerfl/fakesmtp/smtp/SmtpComplianceIntegrationTest.java