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MTA-STS MX Host Validation

What you see when your domain has this problem
No MTA-STS Policy MX Pattern Match Details area Ignore
Add mta-sts monitor for 85.105.73.200

More Information About Mta-Sts Mx Host Validation

This error indicates (per RFC 8461 Section 4.1) that the MX record name for the MTA-STS policy of an MX host DOES NOT match one or more of the policy's "mx" fields. If the MX record name and the "mx" fields do not match, the MTA-STS policy is invalid.

How can I resolve this issue?

  • Confirm that the MX record name and the "mx" fields match
  • If they do not match, update as needed

MxToolbox Delivery Center

This is one problem. Inbox providers check every layer.

Gmail, Yahoo! and Outlook check your email at several layers before it reaches the inbox. Delivery Center monitors and manages every one of them, so you find and fix problems before they cost you delivery.

  • DMARC, SPF & DKIM
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  • DMARC AdoptersSee every sender and know when it's safe to enforce.
  • IT Email AdministratorsCatch DNS, authentication and mailflow changes with alerts.
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