@Tutanota supposing we take GPG (implementation of PGP) as unbreakable;
And the State which asserts a right and a need to read our communications provides each of us with a unique key against an individual secret key for each of us;
And they pass those secret keys to a High Court judge to hold;
And the passphrases, each (probably) different, on paper, one copy, to another High Court judge;
And the law requires our addressees to include the Secret State Snitch;

Then they could recover text.