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Hello AdamTyler-3590,
Thank you for posting in Q&A forum.
If you use SMTP protocol to replicate AD between domain controllers, you can request certificate using Directory Email Replication certificate template.
For more information, please read here.
How to set up SMTP replication on Windows Server 2008-based domain controllers
https://support.microsoft.com/en-us/topic/a7c44b3d-4d8c-bad9-22d2-d8acf6e7ba82
Here is a similar thread for your reference.
https://learn.microsoft.com/en-us/answers/questions/1349747/directory-email-replication-certificate
I hope the information above is helpful.
If you have any questions or concerns, please feel free to let us know.
Best Regards,
Daisy Zhou
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