The mailbox encryption key is static. There is no need to re-encrypted all the mail when it is changed. Since the PGP Secret Key is only decrypted in the client

The mailbox encryption key is static. There is no need to re-encrypted all the mail when it is changed. Since the PGP Secret Key is only decrypted in the client browser or app, there is no need to transmit the decryption password to the server.