Emails should only be accessible under order of a federal judge on an individual basis, and then only with damn compelling evidence. None of this mass email data mining or breaching emails looking for criminals. A green light into privacy is far to easy for government to abuse.
Many email servers like Yahoo, Google, Hotmail, Gmail (I know many run together) have backdoors built right in. They dont need an order or anything, you agree to it when you sign up. Mass email gathering and snooping are common for everything from directed advertising to gov intrusion and it's perfectly legal and business as usual. I still use a Yahoo address for mundane shit like CL but I have a private secure pay server for more meaningful stuff. I'm not a criminal and I will protect my privacy by any means available to me, on principle of for no other reason. Besides Hillary, what idiot uses email for the commission of a crime? I'm sure there are others, and thats what judges and warrants are for.
When a court tells gov "No, keep your greasy meat hooks out of that" then I'm thrilled. They hit a wall while trying to expand their reach. Win for privacy advocates, like myself. They should be able to access email in a serious crime investigation but if the servers are offshore then perhaps it's outside US jurisdiction, even if it is an American company.