[jtdressel]

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.

[brongondwana]

I second those thanks. We very much appreciate your confidence in us!

Disclosure - I run Fastmail, though also only had tangential involvement in this effort.

[tylergetsay]

Can I generate masked emails without fast mail? I already have a domain setup

[jtdressel]

This feature is an integration with Fastmail's masked addresses. You don't need to use their domain, but you do need to use them as your email provider.

Disclosure - I work at 1Password, though I had only tangential involvement in this effort