class MailHeaders extends InternetHeaders implements Serializable, Cloneable {

    @Override
    public synchronized void setHeader(String arg0, String arg1) {
        if (RFC2822Headers.RETURN_PATH.equalsIgnoreCase(arg0)) {
            super.removeHeader(arg0);
        }
        super.setHeader(arg0, arg1);

        modified();
    }

    public  MailHeaders();
    public  MailHeaders(InputStream in);

}