If the original poster is running SmarterMail 12.X, then this is logged in the ADMINISTRATIVE LOGS, but only if they have been set to DETAILED.
The administrative logs can only be accessed by SmarterMail primary admins, they cannot be accessed or viewed by Domain level admins.
The administrative logs will show all of the activity of all administrators, including when they logged in, what they changed or modified, and any accounts which were added or deleted.
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