Thanks for the vote of confidence! If you have a custom domain at fastmail you can avoid any lock-in by using it for your masked addresses. Settings -> Domains -> Team Settings -> Masked email domain.
With that it's entirely portable. You can point your mx records at any other provider.
Disclosure - I work at 1Password, though I had only tangential involvement in this effort.
With that it's entirely portable. You can point your mx records at any other provider.
Disclosure - I work at 1Password, though I had only tangential involvement in this effort.