Connection refused: connect - Java mail API

Question

I am getting the below error while sending email from corporate outlook using java mail API.

javax.mail.MessagingException: Could not connect to SMTP host:       smtp.mycompany.net.au, port: 25;
 nested exception is:
java.net.ConnectException: Connection refused: connect

I am able to telnet the server with the same port my machine.What could be the root cause of the issue?

Code used for sending email is -

Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", mysmtpserver);
props.put("mail.smtp.port", myport);

Session session = Session.getInstance(props,
            new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
            });

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(fromEmailAddress));

message.setRecipients(Message.RecipientType.BCC, addressTo);
message.setSubject(emailSubject);

BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setHeader("Content-Type", "text/html;charset=UTF-8");
messageBodyPart.setHeader("Content-Transfer-Encoding", "quoted-printable"); 
messageBodyPart.setContent(emailBody, "text/html;charset=UTF-8");

Multipart multipart = new MimeMultipart();  
//part 1-add html part
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
String filename = reportFilePath.trim();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));                    
messageBodyPart.setFileName(filename);                  
multipart.addBodyPart(messageBodyPart);

Appreciated any help in resolving it.

Thanks Libin

Answer 1

java.net.ConnectException: Connection refused: connect error throws due to the following reasons that you have to check:

1. Your hostname or port
2. Your properties code is accurately written
3. Make sure firewall is not blocking the port
4. Provide password if your server require it

Thanks for providing your code. Pleas apply the following code. Its very easy understandable and works fine. 100% tested

import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;   
import javax.mail.event.*;      
import java.net.*;
import javax.activation.*;

public class SendEmail extends ConfigProperties{

        public static void send(String from, String to, String subject, String content) throws AddressException, MessagingException{

        ErrorCheck ec   = new ErrorCheck();
        String error = "";

        try{
            error   = ec.error();

            String smtp = getPropVal("SMTP");
            String host = getPropVal("HOST");

            Properties props=new Properties();
                props.put(smtp,host);
            Session   session1  =  Session.getDefaultInstance(props,null);
            Message msg =new MimeMessage(session1);

            msg.setHeader("Content-Type", "text/plain; charset=UTF-8");
            msg.setHeader("Content-Transfer-Encoding", "quoted-printable");           

               msg.setFrom(new InternetAddress(from));
                   msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to,false));
               msg.setSubject(subject);
               msg.setContent(content,"text/html; charset=UTF-8");      

                Transport.send(msg); 

            }catch(Exception e){
            ec.errorMsg(error+"SendEmail.send()", e);
            }
        }
}