Nothing. I've been forced to use this to monitor my own email for a one man financial services company for compliance purposes, which made it utterly useless to me. Review collected by and hosted on G2.com.
Now that I've shut the business down, they auto-renew a yearly contract and continue to charge me monthly. It's like a gym membership that is a never ending loop to end. I would highly recommend any service provider over Global Relay that has even an inkling of customer service. Review collected by and hosted on G2.com.