How does this compare to postal secrecy laws? Post has a special place in law, right? Opening someone's post without a warrant is potentially a serious crime, r

How does this compare to postal secrecy laws? Post has a special place in law, right? Opening someone's post without a warrant is potentially a serious crime, right? I'd be happy with something equivalent for encryption: private and protected by default, court warrant can force user to disclose. If it's gone, well... Clearly, this isn't what's proposed here.