if you pretend to pour salt into your mouth you can actually taste it....not sure how but it is something your brain does and because what it tastes like i guess
i dunno about tasting it, but i know if you imagine really bitter tasting lemon or something you get loads of saliva in your mouth, kinda the same sort of thing i guess.
It's becuase they're in his email, and they'll show because he has sufficient permissions to display that, whereas not all of us (only some) are logged into his email account.