Troubleshooting a 550 - Authentication/Relay error message

After configuring the SpamExperts email filtering service, emails may bounce with an error message similar to:

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

To resolve this, make sure that after changing the MX records the Mail Exchanger in cPanel is set to Local Mail Exchanger:

Error MX


If you still getting errors, please consult this giude

  • error
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