Not OP, but I use Mailbox.org. They have a neat feature where you can give them one or more PGP public keys and they encrypt the bodies of all plaintext emails

Not OP, but I use Mailbox.org. They have a neat feature where you can give them one or more PGP public keys and they encrypt the bodies of all plaintext emails to those keys. It's not perfect (you're still trusting them to not be compromised) but it means even if your account gets taken over, your email history remains private.