How To Troubleshoot SpamExperts 550 - Authentication/Relay Error

If your emails start bouncing with an error message similar to the one below after configuring the SpamExperts email filtering service:

550-Please turn on SMTP Authentication in your mail
   client, or log in to the 550-IMAP/POP3 server before sending your message.
   mx48.antispamcloud.com 550-[31.204.154.235]:54550 is not permitted to relay
   through this server 550 without authentication.

Steps to Resolve the Error

Follow these steps to troubleshoot and fix the 550 authentication/relay error:

1. Log in to cPanel and locate the Email pane.
2. Click on Email Routing.
3. Ensure that the Mail Exchanger is set to Local Mail Exchanger. This setting ensures that the server always accepts and delivers mail to the local mailbox for this domain.

Additional Resources

SpamExperts recommends reviewing the information in the following knowledgebase article for more details: Incoming Rejection Classifications.

Gotchas to Avoid

• Ensure that SMTP authentication is enabled in your email client settings.
• Regularly check your server settings after making changes to ensure proper mail flow.