properties = System.getProperties();
        properties.put("mail.smtp.host", Host);
        properties.put("mail.smtp.port", Port);
        int port = Integer.parseInt(Port);
        URLName urln = new URLName(Host);
        if (TLS) {
            properties.put("mail.smtp.starttls.enable", "true");
        }
        if (SSL) {
            properties.put("mail.smtp.starttls.enable", "true");
            mailSession = Session.getDefaultInstance(properties);
            smtpt = new SMTPSSLTransport(mailSession, urln);
        } else if (authentication) {
            properties.put("mail.smtp.auth", "true");
            mailSession = Session.getDefaultInstance(properties);
            smtpt = new SMTPTransport(mailSession, urln);
        }
        if (mailSession == null) {
            mailSession = Session.getDefaultInstance(properties);
        }
        if (smtpt != null) {
            smtpt.connect(Host, port, User, Pass);
        }