I like a piss take as much as the next man but please leave any personal correspondence, between you and them, in your inbox. If people want to read it I'm sure PM's are sufficient but I believe that posting personal details, including emails, of people that aren't in a position to respond is jolly unsporting.
Respect the quarry applies just as much here, as it does in the field.
If Mr Doe wants to bring the discussion here then it's fair game, but as he isn't here (or doesn't want to) then private correspondence should remain so.
I'll say here. If people want to discuss the policy