Unable to send email using JavaMail API:getting error Must issue a STARTTLS command first. o1sm34552

[Monica. Shiralkar]

I am trying to send email using java mail API. I tried to run code (below in the email) but am getting error below error message:

com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. o1sm34552478pax.2 - gsmtp

at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2109)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1610)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1118)
at javax.mail.Transport.send0(Transport.java:195)
at javax.mail.Transport.send(Transport.java:124)
at SendMailBySite.main(SendMailBySite.java:35)


Below is the code I am using:

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

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

  String host="smtp.gmail.com";
  final String user="[e-mail]";//change accordingly
  final String password="myPassword";//change accordingly
  
  String to="[e-mail]";//change accordingly

   //Get the session object
   Properties props = new Properties();
   props.put("mail.smtp.host",host);
   props.put("mail.smtp.auth", "true");
   
   Session session = Session.getDefaultInstance(props,
    new javax.mail.Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
	return new PasswordAuthentication(user,password);
      }
    });

   //Compose the message
    try {
     MimeMessage message = new MimeMessage(session);
     message.setFrom(new InternetAddress(user));
     message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
     message.setSubject("javatpoint");
     message.setText("This is simple program of sending email using JavaMail API");
     
    //send the message
     Transport.send(message);

     System.out.println("message sent successfully...");
 
     } catch (MessagingException e) {e.printStackTrace();}
 }
}

Please advice how to get rid of this error message and send mail successfully.

Thanks.

[Paul Clapham]

The JavaMail FAQ has an entry explaining how to access Gmail via JavaMail.