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Messages in the High Risk Delivery Pool won't pass SPF checks, and therefore won't be accepted by the destination email organization.

Verify that the outbound message wasn't identified as spam by Microsoft 365 or Office 365 and routed through the High Risk Delivery Pool. This would include any unprovisioned domains you might be relaying through Microsoft 365 or Office 365.

We limit the number of emails with unprovisioned domains that a tenant can send.Īdd your on-premises IPs, if any, to the SPF record of any domains you send for. To do this, we recommend that you use a publicly available SPF or DNS record checker on the web. Verify the SPF DNS record for your domain. To fix this issue, do the following steps: The Diagnostic information for administrators section in the bounce message will contain the original error message when Office 365 tried to send the message to the external email server or service. This bounce message most likely indicates a Sender policy framework (SPF) configuration issue in your Microsoft 365 or Office 365 organization. Contact your email admin and refer them to this information so they can try to resolve the issue for you. Only an email admin in your Microsoft 365 or Office 365 organization can fix this issue.

This topic describes what you can do if you see error code 550 5.7.23 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN).

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