public class Sender {

    private Properties properties;
    private Session session;
    private String currentEmail;

    public Sender(String host,String port,final String user,final String password){
        properties = new Properties();
        properties.setProperty("mail.smtp.auth","true");
        properties.setProperty("mail.smtp.host", host);
        properties.setProperty("mail.smtp.port",port);

        currentEmail = user;
        session = Session.getInstance(properties,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(user,password);
                    }
                });
    }

    public void send(String email,String subject,String body) throws Exception{
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(currentEmail));
        msg.setRecipient(Message.RecipientType.TO, new InternetAddress(email));
        msg.setSubject(subject);
        msg.setContent(body, "text/html; charset=utf-8");
        Transport.send(msg);
    }

}

public class Main {

    private static com.devcolibri.tls.Sender tlsSender = new com.devcolibri.tls.Sender("smtp.mail.ru", "25", "мыло@mail.ru", "пароль");

    public static void main(String[] args) {

        try {
            tlsSender.send("кому@inbox.ru", "Проверка", "Привет, <b>Target</b>!");
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}