javax.mail.MessagingException : Could not connect to SMTP host :, port : 25

Posted on 2011-03-25
Last Modified: 2013-11-24
I am getting an error while sending the mail from my java application

I have attached the error document. Please help soon.
Thanks in advance.

import java.util.Properties;
import javax.activation.*;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.AddressException;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

public class Mail {
	public static void main(String[] args) {
        try {
            new Email().sendSimpleMail("Test from Java", "", "", "Testing...");

        catch(Throwable e) {

    public static class Email {
        public void sendSimpleMail(String subject, String to, String from,String messageText) throws AddressException, MessagingException {

            Properties mailProps = new Properties();
            mailProps.put("mail.transport.protocol", "smtp");
            mailProps.put("mail.smtp.starttls.enable", "true");
            mailProps.put("", "");
            mailProps.put("mail.smtp.auth", "true");
            mailProps.put("mail.smtp.user", "");
            mailProps.put("mail.debug", "true");
            mailProps.put("mail.smtp.port", "25");
            mailProps.put("mail.smtp.debug", "true");
            Authenticator auth = new MailAuthenticator();
            Session session = Session.getDefaultInstance(mailProps, auth);

            Message message = new MimeMessage(session);

            message.setFrom(new InternetAddress(from));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));


            message.setContent(messageText, "text/html");


        private class MailAuthenticator extends javax.mail.Authenticator {
            public PasswordAuthentication getPasswordAuthentication() {
                String user = "";
                String pwd = "abcd";
                return new PasswordAuthentication(user, pwd);

Open in new window

Question by:meeramt
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 7
  • 5
LVL 92

Expert Comment

ID: 35219052
looks like the mail server isn't listening on port 25
try 465, or check what port the mail server is actually using
LVL 92

Expert Comment

ID: 35219130
587 is another to try

Author Comment

ID: 35221596
Mail properites on outlook is showing 25 as port...
Tried with both the ports but getting the same error.. :-(
Is Your DevOps Pipeline Leaking?

Is your CI/CD pipeline a hodge-podge of randomly connected tools? You’ve likely got a tool to fix one problem & then a different tool to fix another, resulting in a cluster of tools with overlapping functionality. Learn how to optimize your pipeline with Gartner's recommendations

LVL 92

Expert Comment

ID: 35224018
does you network use a proxy

Author Comment

ID: 35225591
no.. it does not  use any proxy.. the mail server is accessed through internet only.. we do not use any proxy to connect to it..
LVL 92

Expert Comment

ID: 35225596
thats strange. Is outlook running on the same box
and do you have any firewalls

Author Comment

ID: 35225601
outlook is running on same machine n firewall is turned off..

Accepted Solution

meeramt earned 0 total points
ID: 35231016
There was a problem in my mail server so was not able to connect.. thanks a lot for the help...

Author Comment

ID: 35231049
closing d question..

Author Comment

ID: 35231519
closing this question as issue has been resolved.. thanks everyone for their time n opnion..
LVL 92

Expert Comment

ID: 35236288
> but experts confirmed that there is not problem in the code so checked the connectivity...

so award them points for helping. We have no way of knowing you have connectivity issues

Author Closing Comment

ID: 35304190
I was facing the error because of server issue at my end... but experts confirmed that there is not problem in the code so checked the connectivity...

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …
Suggested Courses

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question