import java.security.Provider;
import java.util.*;
import javax.*;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;


public class EmailSend extends TimerTask {

    public static void main(String[] args) {
        Timer t = new Timer();
        t.schedule(new EmailSend(), 0, 10000);
    }

    @Override
    public void run() {

        try {
            String host = "smtp.gmail.com";
            String user = "NAZWA_USERA";
            String pass = "some_pass";
            String to = "odbiorca@gmail.com";
            String from = "javatest95@gmail.com";
            String subject = "Test wysyłania maila.";
            String messageText = "";
            boolean sessionDebug = false;

            Properties props = System.getProperties();

            props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
            props.put("mail.smtp.starttls.enable", "true");
            props.put("mail.smtp.host", host);
            props.put("mail.smtp.port", "587");
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.starttls.required", "true");

            //java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            Session mailSession = Session.getDefaultInstance(props, null);
            mailSession.setDebug(sessionDebug);
            Message msg = new MimeMessage(mailSession);
            msg.setFrom(new InternetAddress(from));
            InternetAddress[] address = { new InternetAddress(to) };
            msg.setRecipients(Message.RecipientType.TO, address);
            msg.setSubject(subject);
            msg.setSentDate(new Date());
            msg.setText(messageText);

            Transport transport = mailSession.getTransport("smtp");
            transport.connect(host, user, pass);
            transport.sendMessage(msg, msg.getAllRecipients());
            transport.close();
            System.out.println("message send successfully");
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}