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Non-Delivery Report: [554 5.4.4 Message rejected due to your Exclaimer integration being incomplete]

  1. Exclaimer Knowledge Base
  2. Solutions
  3. Mail Flow
Payal Arya
  • Updated

Scenario

You notice that your email messages are being rejected when they attempt to route to Exclaimer, displaying a non-delivery report with a similar message:

ERROR:  554 5.4.4 Message rejected due to your Exclaimer integration being incomplete       

Reason

You received this error message as your Exclaimer subscription is not using a per-tenant certificate.  This configuration has been a default setup for the last 4 years and is now required by Microsoft when routing through a service similar to ours.

Resolution

To resolve this issue, you need to configure your Exclaimer subscription to use the per-tenant certificate. For more information, see how you can re-run the Microsoft 365 connector setup.