Knowledge Base

550 Authentication Required

If you're seeing 550 Authentication Required when sending emails, it means the server has not been correctly configured to receive emails from that domain.

The two top causes for this error are:

  • Your MX records are not up to date or fully propagated. Please follow our tutorial to find your DNS records and copy them over to your DNS manager.
  • Email sending is disabled for that domain. Ensure you have selected “Use this server to handle my e-mails” inside the “Email Routing” section.
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