Question

I am using the following code to send mail:

protected void mailSettings() {
    Object lookedUp = null;
    String mailSettingValues[] = null;
    try {
        InitialContext initialContext = new InitialContext();
        lookedUp = initialContext.lookup("java:/comp/env/mailsettings");
        mailSettingValues = lookedUp.toString().split(",");
        smtphost = mailSettingValues[0];
        port = mailSettingValues[1];
        username = mailSettingValues[2];
        password = mailSettingValues[3];
    } catch (NamingException e) {
        e.printStackTrace();
    }

    m_properties = new Properties();
    m_properties.put("mail.smtp.host", smtphost);
    m_properties.put("mail.smtp.auth", "true");
    m_properties.put("mail.smtp.starttls.enable", "true");
    m_properties.put("mail.smtp.port", port);

    m_Session = Session.getDefaultInstance(m_properties,
            new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });

}

public void sendMail(String mail_from, String mail_to, String mail_subject,
        String m_body) {
    try {
        m_simpleMessage = new MimeMessage(m_Session);
        m_fromAddress = new InternetAddress(mail_from);
        m_toAddress = new InternetAddress(mail_to);

        m_simpleMessage.setFrom(m_fromAddress);
        m_simpleMessage.setRecipient(RecipientType.TO, m_toAddress);
        m_simpleMessage.setSubject(mail_subject);

        m_simpleMessage.setContent(m_body, "text/plain");

        Transport.send(m_simpleMessage);
    } catch (MessagingException ex) {
        ex.printStackTrace();
    }
}

As of this code we need to have email from address and the password for the same, but I would like to send mail to to_email address without the authentication(getting user password).

How can this be done?

I need to do the following things:

1. get the from address from properties or context file
2. get the to address from properties or context file
3. send mail to to_address without authenticating the from address

Answer 1

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

public class SimpleSendEmail {
    public static void main(String[] args) {

        String host = "your smtp host";
        String to = "[e-mail]";
        String from = "[e-mail]";
        String subject = "My First Email";
        String messageText = "I am sending a message using the"
                + " JavaMail API.\n" + "Here type your message.";
        boolean sessionDebug = false;
        Properties props = System.getProperties();
        props.put("mail.host", host);
        props.put("mail.transport.protocol", "smtp");
        Session session = Session.getDefaultInstance(props, null);
        // Set debug on the Session so we can see what is going on
        // Passing false will not echo debug info, and passing true
        // will.
        session.setDebug(sessionDebug);
        try {
            Message msg = new MimeMessage(session);
            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.send(msg);
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
}