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.
mx48.antispamcloud.com 550-[31.204.154.235]:54550 is not permitted to relay
through this server 550 without authentication.
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To resolve this, make sure that after changing the MX records the Mail Exchanger in cPanel is set to Local Mail Exchanger:
SpamExperts recommend reviewing the information in the following knowledgebase article for further information:
- https://documentation.solarwindsmsp.com/spamexperts/documentation/Content/C_Domain%20Level/incoming/incoming-rejection-classifications.htm?Highlight=550
How to: Resolve a "Domain already exists" error. »
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