In the scenario with mailservers with PGP encrypted messages I did intend the messages to be encrypted client side, perhaps it was not clear enough. When I selfhost my own server (and my trusted friend selfhosts his), I can be completely sure that the encrypted messages will not be dumped either through storage or while relaying them. If sent PGP end-to-end encrypted messages through, say, gmail, then I'm not 100% sure that gmail won't store these messages somewhere and decrypt them whenever quantum computing becomes available for them.