‘SMTP Error 523’ indicates a failure in establishing a connection with the recipient’s server, primarily due to network issues like DNS problems, routing errors, or server outages at the recipient’s end. Incorrect server settings or expired domain registrations can also cause this error, preventing the email server from reaching the destination server.
Resolving the Error – Solution
To resolve this error, check your network connectivity and server settings. Ensure DNS configurations are correct and the recipient’s domain is active. If using a plugin like Easy WP SMTP, confirm its settings align with your server. In cases of server downtime, retry sending the email later. For ongoing issues, consult your hosting provider or network administrator.