>Leaving your computer unlocked usually also breaks policy (except if the policy is very much useless). Agreed. But at this point, only one person has breached

>Leaving your computer unlocked usually also breaks policy (except if the policy is very much useless). Agreed. But at this point, only one person has breached policy and it's a forgetfulness/oversight kind of breach. If someone actively takes control of the machine to send an email, that's a much more serious offence.