The Ondemand Monitoring tool will let you know the time stamp of the last successful sign in, send and read email action ...

The Ondemand Monitoring tool will let you know the time stamp of the last successful sign in, send and read email action for the last 30 minutes. If there is any issue, then the tool will let you know the time of the error and the details of that issue. The Ondemand Monitoring tool also checks the last 24 hour window to provide info on how many successful sign in, send and read email actions the user performed.