Domain Rewrite: Unable to validate DKIM-Signature header (4376245)

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Title

Domain Rewrite: Unable to validate DKIM-Signature header
Description

When sending email through ERS you receive NDRs regarding DKIM dkim=fail (no key for signature)
Cause

The vanity domain in Microsoft 365 tenant is not enabled for DKIM under Email authentications settings.
Resolution
To enable DKIM for your vanity domain(s) in your Microsoft 365 tenant, please follow the link below and select the "Email Authentication Settings" option:
- https://security.microsoft.com/threatpolicy
Additional Information

For additional information on how to configure DKIM for a vanity Domain in M365 please see the following link https://learn.microsoft.com/en-us/defender-office-365/email-authentication-dkim-configure

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