Exchange Message Tracking Logging must be enabled.

Severity
Group ID
Group Title
Version
Rule ID
Date
STIG Version
mediumV-228362SRG-APP-000098EX16-MB-000090SV-228362r879566_rule2023-12-182
Description
A message tracking log provides a detailed log of all message activity as messages are transferred to and from a computer running Exchange. If events are not recorded, it may be difficult or impossible to determine the root cause of system problems or the unauthorized activities of malicious users.
ℹ️ Check
Open the Exchange Management Shell and enter the following command: Get-Transportservice | Select Name, MessageTrackingLogEnabled If the value of MessageTrackingLogEnabled is not set to True, this is a finding.
✔️ Fix
Open the Exchange Management Shell and enter the following command: Set-Transportservice <IdentityName> -MessageTrackingLogEnabled $true Note: The <IdentityName> value must be in quotes.