Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 578;

Question

I am new in Java. I want to build an application which will send email to my clients. I searched over stackoverflow but didn't get any desired solution for that. Somewhere I saw that this could be an issue of firewall but didn't get the solution for fixing it. I am using Ubuntu 14.10
//Here is my code.

public class sendMail {

    public void send(String from, String to, String subject, String body) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "587");
        props.put("mail.smtp.socketFactory.class",
            "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "587");

        Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("xxxxxxx@gmail.com","xxxxx");
            }
        });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("xxxxxx@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse("xxxx@domain.com"));
            message.setSubject("Testing Subject");
            message.setText("Hello this is not spam," +
                "\n\n This is a JavaMail test...!");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }  
}  

And my Error is:

Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587;
    nested exception is:
       java.net.ConnectException: Connection timed out
       at dbdemo.sendMail.send(sendMail.java:54)
       at dbdemo.DBDemo.main(DBDemo.java:62)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 587;
    nested exception is:
       java.net.ConnectException: Connection timed out
       at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1706)
       at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:525)
       at javax.mail.Service.connect(Service.java:313)
       at javax.mail.Service.connect(Service.java:172)
       at javax.mail.Service.connect(Service.java:121)
       at javax.mail.Transport.send0(Transport.java:190)
       at javax.mail.Transport.send(Transport.java:120)
       at dbdemo.sendMail.send(sendMail.java:49)
       ... 1 more
Caused by: java.net.ConnectException: Connection timed out
       at java.net.PlainSocketImpl.socketConnect(Native Method)
       at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
       at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
       at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
       at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
       at java.net.Socket.connect(Socket.java:579)
       at java.net.Socket.connect(Socket.java:528)
       at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:284)
       at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:227)
       at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1672)
       ... 8 more
Java Result: 1

Any help would be appreciated. Please help me.

Answer 1

Throw away the code that you cut and pasted from someone who doesn't understand how to use JavaMail and use the code for connecting to Gmail in the JavaMail FAQ.

If it doesn't work for you, follow the debugging tips in the JavaMail FAQ.

If you still can't figure it out, and can't find the answer in the JavaMail FAQ, post the JavaMail debug output here.

Answer 2

This code worked for me,

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

public class Email {

private static String USER_NAME = "xxxx";  // GMail user name (just the part before "@gmail.com")
private static String PASSWORD = "xxxx"; // GMail password
private static String RECIPIENT = "xxx@gmail.com";

public static void main(String[] args) {
    String from = USER_NAME;
    String pass = PASSWORD;
    String[] to = { RECIPIENT }; // list of recipient email addresses
    String subject = "Java send mail example";
    String body = "Welcome to JavaMail!";

    sendFromGMail(from, pass, to, subject, body);
}

private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
    Properties props = System.getProperties();
  String host = "smtp.gmail.com";
   // String host="localhost";
  // props.put("mail.smtp.ssl.trust", "smtp.gmail.com");
    props.put("mail.smtp.starttls.enable", "true");
   // props.put("mail.smtp.host", host);
   props.put("mail.smtp.ssl.trust", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", pass);
    props.put("mail.smtp.port", "587");//587
    props.put("mail.smtp.auth", "true");
   //System.out.println("success point 1");

    Session session = Session.getDefaultInstance(props);
    MimeMessage message = new MimeMessage(session);

    try {
         //System.out.println("success point 2");

        message.setFrom(new InternetAddress(from));
        InternetAddress[] toAddress = new InternetAddress[to.length];

        // To get the array of addresses
        for( int i = 0; i < to.length; i++ ) {
            toAddress[i] = new InternetAddress(to[i]);
        }

        for( int i = 0; i < toAddress.length; i++) {
            message.addRecipient(Message.RecipientType.TO, toAddress[i]);
        }

         //System.out.println("success point 3");

        message.setSubject(subject);
        message.setText(body);
        // System.out.println("success point 4");

        Transport transport = session.getTransport("smtp");
        // System.out.println("success point 5");

        transport.connect(host, from, pass);
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
        //System.out.println("success 6");
    }
    catch (AddressException ae) {
        ae.printStackTrace();
    }
    catch (MessagingException me) {
        me.printStackTrace();
    }
  }
}

And i had used some jar files are activation,java-mail-1.4.4,javamail-smtp-1.4.2,pop3,mail-6.0.0-sources

Answer 3

Connection timeouts typically result from

• some kind of firewall on the way that simply eats the packets without telling the sender things like "No Route to host"
• packet loss due to wrong network configuration or line overload
• too many requests overloading the server

Here is How do I turn off firewall on Ubuntu

If that doesn't work try Changing the props.put("mail.smtp.port", "587"); to props.put("mail.smtp.port", "465"); or props.put("mail.smtp.port", "25");

---

Some further info (not timeout related), once you're connected:

Don't forgot to Double check your login credentials. because they may cause Authentication Failed Exception if provided incorrect