Thread: [Asking] Problem send email

Hi all,

I got the problem about send email If I used protocol besides smtp. I success if i was sending email with smtp protocol. But I failed if I was sending with POP, IMAP.
It is the succed code if sending with smtp.

import java.util.Properties;
import javax.mail.Authenticator;
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;
 
/**
 *
 * @author user
 */
public class SendEmail {
 
    public static void main(String[] args) {
        // Recipient's email ID needs to be mentioned.
        String to = "userTo@gmail.com";
 
        // Sender's email ID needs to be mentioned
        String from = "userFrom@gmail.com";
 
        // Assuming you are sending email from localhost
        String host = "gmail.com";
 
        // Get system properties
//        Properties properties = System.getProperties();
        Properties properties = new Properties();
        properties.put("mail.smtp.host", "smtp.gmail.com");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.debug", "false");
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.port", "465");
        // Setup mail server
//        properties.setProperty("smtp.gmail.com", host);
 
        // Get the default Session object.
        Session session = Session.getDefaultInstance(properties, new Authenticator() {@Override
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication("userFrom@gmail.com", "YourPassword");
        }});
 
        try {
            // Create a default MimeMessage object.
            MimeMessage message = new MimeMessage(session);
 
            // Set From: header field of the header.
            message.setFrom(new InternetAddress(from));
 
            // Set To: header field of the header.
            message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(to));
 
            // Set Subject: header field
            message.setSubject("This is the Subject Line!");
 
            // Now set the actual message
            message.setText("This is actual message");
 
            // Send message
            Transport.send(message);
            System.out.println("Sent message successfully....");
        } catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
}

I already search and found this link, but got error. The link contain these code below

Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("IMAP");
store.connect(host, username, password);
Folder inbox = store.getFolder("INBOX");
inbox.open(Folder.READ_WRITE);
Message[] messages = inbox.getMessages( );

But I got error about using that code.

Please anyone know, share this info to me

Thanks for replay..

Now I understand what pop3 and imap are. Last time I got error because I didn't add certificate to my keystore. Thanks Norm and djsiavens.