Example to send an e-mail from your Java application (with or without TLS authentication)

In this post I just wanted to share a small example to send an e-mail from your Java application, using TLS authentication. You’ll need to include the javax.mail.jar library from JavaMail in your project as a dependency…

I think all steps are pretty much self-explaining, like how to set the host, username and password, and how to add more recipients…

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class SendMail {

  public static void main(String[] args) {
    new SendMail();
  }

  public SendMail() {
    String toAddress = "recipient@you.com";
    String fromAddress = "from@me.com";

    Properties properties = System.getProperties();
    properties.setProperty("mail.smtp.host", "smtp.website.net");
    properties.setProperty("mail.smtp.port", "25");
    properties.setProperty("mail.smtp.auth", "true");
    properties.setProperty("mail.smtp.starttls.enable", "true");

    // To override the Authenticator in the session
    Authenticator authenticator = new Authenticator() {
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("username_or_email", "THE_P@SSWORD");
      }
    };

    // Create a session object with our above properties and the authenticator
    Session session = Session.getInstance(properties, authenticator);

    try {
      // Create a MimeMessage object.
      MimeMessage message = new MimeMessage(session);

      message.setFrom(fromAddress);
      message.addRecipient(Message.RecipientType.TO, new InternetAddress(toAddress));
      // Add TO, CC or BCC addresses as needed...

      message.setSubject("This is a subject for my e-mail...");
      message.setText("This is the body of my message...\n\nSincerely yours,\n\n\nTom");

      // Actually end the message...
      Transport.send(message);
      System.out.println("Message has been sent");
    } catch (MessagingException e) {
      e.printStackTrace(System.err);
    }
  }
}

If you don’t need authentication, your example becomes a lot shorter:

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class SendMail {

  public static void main(String[] args) {
    new SendMail();
  }

  public SendMail() {
    String toAddress = "recipient@you.com";
    String fromAddress = "from@me.com";

    Properties properties = System.getProperties();
    properties.setProperty("mail.smtp.host", "smtp.website.net");

    // Create a session object with our above properties
    Session session = Session.getDefaultInstance(properties);

    try {
      // Create a MimeMessage object.
      MimeMessage message = new MimeMessage(session);

      message.setFrom(fromAddress);
      message.addRecipient(Message.RecipientType.TO, new InternetAddress(toAddress));
      // Add TO, CC or BCC addresses as needed...

      message.setSubject("This is a subject for my e-mail...");
      message.setText("This is the body of my message...\n\nSincerely yours,\n\n\nTom");

      // Actually end the message...
      Transport.send(message);
      System.out.println("Message has been sent");
    } catch (MessagingException e) {
      e.printStackTrace(System.err);
    }
  }
}

Enjoy!