If you stop the policy engine hub before stopping IIS (when applicable), there is a risk that emails may be deleted or transmitted without being monitored by CA DataMinder, or that emails may be imported twice. These consequences can arise if the Exchange or Domino server agent passes emails to the hub while it is shutting down.
When the email server agent receives no response from the hub, it infers there has been an email failure and uses the EMailFailureMode registry value to determine how to handle the email: this value can be set to Delete, Allow, or Mark (see EMailFailureMode).
Alternatively, the timing of the hub shutdown may be such that an email is sent to a policy engine for processing immediately before the hub shuts down. The policy engine successfully processes the email but is unable to notify the hub. Consequently, the email is resubmitted to a policy engine when the hub restarts.
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