This example uses JavaMail (mail.jar). Replace the to and from addresses, and the username and password. Compile the class and run it.
import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMessage.RecipientType; public class JangoSMTPDemo { public static void main(String[] args) throws MessagingException { new JangoSMTPDemo().run(); } private void run() throws MessagingException { Message message = new MimeMessage(getSession()); message.addRecipient(RecipientType.TO, new InternetAddress("to_name@wherever.com")); message.addFrom(new InternetAddress[] { new InternetAddress("your_name@somewhere.com") }); message.setSubject("Hello from JangoSMTP using JavaMail"); message.setContent("This message use JavaMail", "text/plain"); Transport.send(message); } private Session getSession() { Authenticator authenticator = new Authenticator(); Properties properties = new Properties(); properties.setProperty("mail.smtp.submitter", authenticator.getPasswordAuthentication().getUserName()); properties.setProperty("mail.smtp.auth", "true"); properties.setProperty("mail.smtp.host", "relay.jangosmtp.net"); properties.setProperty("mail.smtp.port", "25"); return Session.getInstance(properties, authenticator); } private class Authenticator extends javax.mail.Authenticator { private PasswordAuthentication authentication; public Authenticator() { String username = "your JangoSMTP username"; String password = "your JangoSMTP password"; authentication = new PasswordAuthentication(username, password); } protected PasswordAuthentication getPasswordAuthentication() { return authentication; } } }