A slight detour today as I recharge my creative batteries a bit. It's relevant in the general "our internets are broken" kind of way.
Long story short, your email is fair game to the government. Basically, if you leave your email on the server (and most people do, via web mail or IMAP servers), after a set period of time it is no longer considered private, and everybody and their mother can read it all.
Even failing that, most folks don't realize that emails are sent "in the clear"--unencrypted--from server to server on the internet until it reaches its destination.
Good to know, eh?
You may have thought it was a sealed envelope, but it's more like a postcard.