Exchange Message Tracking Logging must be enabled.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-228362
EX16-MB-000090
SV-228362r879566_rule
Medium
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.