Symptoms
Different From Address for particular client event notifications.
Diagnoses
The client event notification for a particular process randomly send from a different from address rather than the one which was being specified. This happens intermittently and is does not happens to all processes or all client event notification.
Resolution
A coldfix has been provided for this issue that happens on K2 blackpearl 4.6.3. After applying the coldfix from K2 support, the issue has been resolved.