Wonderful Pythonesque erruption.
Hey folks. Did you realise that communicating with hundreds or thousands of people may not be 100.000% secure? WHATEVER the reason, it ain't going to be private for long. So on that basis, only the loons or stupids (may overlap) would bring out this sort of thing. An organisation can decide which side of the line it wants to be when communicating with employees:-
(a) End to single-end encrypted to trusted employees who know what's coming to them if they blab
or on the otherside.
(b) anything else. (Fred Flob's Fitness Freakout is just as much a risk as China State Snoop-mail.)
Stop pretending!