content: That's why it would be great if Tutanota would provide a hidden service. //edit: Just to clarify, it's not worse than using E-Mail without Tor, in which case any hop on the way can read lots and lots of meta and content data from your mail. With Tor you get the benefit of hiding your IP. If there is identifying information in the Mail, then you associate your identity with a connection to a Tor node. Read: Don't send unencrypted mails and don't write any identifying information into any headers (including the subject) or you defy the purpose of using Tor.