title: Error in Sending mail by Java
body: <p>My code is : </p>
  
  <pre><code>// File Name SendEmail.java
  
  import java.util.*;
  import javax.mail.*;
  import javax.mail.internet.*;
  import javax.activation.*;
  
  public class SendEmail
  {
     public static void main(String [] args)
     {
  
        // Recipient's email ID needs to be mentioned.
        String to = "toEmail@gmail.com";
  
        // Sender's email ID needs to be mentioned
        String from = "fromEmail@gmail.com";
  
        // Assuming you are sending email from localhost
        String host = "localhost";
  
        // Get system properties
        Properties properties = System.getProperties();
  
        // Setup mail server
        properties.setProperty("mail.smtp.host", host);
  
        // Get the default Session object.
        Session session = Session.getDefaultInstance(properties);
  
        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();
        }
     }
  }
  </code></pre>
  
  <p>My program was working correctly last night; I could send email from any address to any other, but now this error is occuring:</p>
  
  <pre><code>javax.mail.SendFailedException: Sending failed;
    nested exception is:
      class javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
    nested exception is:
      java.net.ConnectException: Connection refused
      at javax.mail.Transport.send0(Transport.java:218)
      at javax.mail.Transport.send(Transport.java:80)
      at SendEmail.main(SendEmail.java:49)
  </code></pre>
  
  <p>Line 49 is: </p>
  
  <pre><code>Transport.send(message);
  </code></pre>
  
  <p>Can anyone help me fix this error?</p>
  
  <p>My operating system is : Linux,Fedora 16 -kernel: 3.3.7</p>