What they're saying is they can't access your mail at rest, in your mailbox. I'm guessing they do spam and virus checks etc, which has to done decrypted and can

What they're saying is they can't access your mail at rest, in your mailbox. I'm guessing they do spam and virus checks etc, which has to done decrypted and can be syphoned off to another store. I am suspicious of any mail service that makes the claims that they do based on how email works. Of course PGP is encrypted at point of origin, but that means that they can't be security checked, other than basic DNS auth checks. Less of an issue I grant you, but an issue none the less.