To resolve email notification issues, verify your email service configuration, including SMTP settings and authentication credentials, and check the email sending logic in your application.

If your Node.js application is failing to send email notifications, it can lead to missed communication and user frustration. To troubleshoot this issue, start by verifying your email service configuration. Ensure that your SMTP settings, including the host, port, and authentication credentials, are correct. If you are using a third-party service like SendGrid or Mailgun, consult their documentation for specific requirements and configuration details. Check your application’s email sending logic to confirm that it is being triggered correctly and that any necessary parameters (like the recipient's address and message content) are properly formatted. Use logging to capture any errors that occur during the email-sending process; this can help you identify issues related to connectivity, authentication, or invalid message formats. If you're running your application in a containerized environment, ensure that the network settings allow outbound connections to the email service. Finally, consider implementing a retry mechanism for sending emails, as transient network issues can sometimes cause failures. By systematically examining these aspects, you can effectively resolve issues related to email notifications in your Node.js application.