I was hopeful Migadu was going to work for you. See https://migadu.com/procon/#no-mailbox-2fa-yet https://migadu.com/procon/#no-mailbox-2fa-yet for why they don

I was hopeful Migadu was going to work for you. See https://migadu.com/procon/#no-mailbox-2fa-yet https://migadu.com/procon/#no-mailbox-2fa-yet for why they don't (yet) offer it. It also probably explains why it's not more prevalent.