Why Am I Getting a 'Connection Refused' Error When Sending Email in Java?

Sending Email Using Java: Resolving Connection Refused Error

In your code snippet, you are encountering a "Connection refused" error while attempting to send an email using the localhost SMTP server. This indicates that the SMTP server is not listening on that host or port.

Solution

To resolve this issue, you need to either:

1. Configure your local SMTP server: Ensure that you have a valid SMTP server running on your local machine. This can be done by setting up a mail server like Postfix or Exim.
2. Use a cloud-based SMTP service: Consider using a reliable cloud-based SMTP service like Google's SMTP server or Amazon SES. These services provide robust and scalable SMTP functionality without the need to maintain a local server.

Alternative Code using GoogleMail Class

If using a local SMTP server is not feasible, you can utilize the GoogleMail class provided in the response. This class simplifies the process of sending emails using Google's SMTP server. Here's a modified code snippet using GoogleMail:

import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.model.Message;
import javax.mail.MessagingException;
import java.io.IOException;

public class SendEmail {

    public static void main(String[] args) throws IOException, MessagingException {
        // Replace these variables with your own information
        String username = "your_gmail_username";
        String password = "your_gmail_password";
        String recipientEmail = "recipient_email_address";
        String title = "This is the Subject Line!";
        String message = "This is actual message";

        // Construct an authorized Gmail service
        Gmail service = Utils.getGmail(username, password);

        // Send the email
        GoogleMail.Send(service, recipientEmail, "", "user1@XYZ.com", title, message);
        System.out.println("Sent message successfully...");
    }
}

Note that you will need to obtain a refresh token from Google and save it to a file in order to avoid having to enter your password every time you send an email.

Conclusion

By addressing the SMTP connection issue or leveraging the provided GoogleMail class, you can successfully send emails using Java. Remember to adjust the code snippet to include your own email credentials and message content.

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