Fastmail is not a zero-knowledge service. Unless I'm missing something, anti-encryption laws seem to be irrelevant, since they don't really change the position

Fastmail is not a zero-knowledge service. Unless I'm missing something, anti-encryption laws seem to be irrelevant, since they don't really change the position at all. I suppose hypothetically if Fastmail was a zero-knowledge service that law might mean they need to break it, but it's not a zero-knowledge service so the issue doesn't arise. You're going to be hard pressed to find a service provider which ignores valid warrants. Such a service provider would need to either operate unlawfully, or not hold the information (ie be zero-knowledge). Even Protonmail, the bastion of email privacy, has supplied the IP address of a user in the face of a warrant.[0] [0] https://techcrunch.com/2021/09/06/protonmail-logged-ip-address-of-french-activist-after-order-by-swiss-authorities/ https://techcrunch.com/2021/09/06/protonmail-logged-ip-addre...