Email report to see who is using a personal certificate in our organization

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We are looking to track the actual usage of personal certs in our organization. I am not able to find where I can see that information. Any guidance would be greatly appreciated. 

1 Reply
Not sure there's anything you can use here. There's the "Message encryption report", but it covers messages protected by OME and sensitivity labels afaik, not S/MIME. You can look into using (extended) message trace to fetch some info, that's probably your best bet.