Exactly. Anything you do work-related concerns your employers so they have the right to check everything you're doing anyway.
If you want to do personal things like send joke emails and whatnot, send them to every single member of the workplace, and get them to send some back. Then if they're gonna "crack down" on personal usage they'd need to fire everyone. And I don't think that will be happening muHAHAHaHAhaAa
