I switched to dockhand and it handles that nicely, including scanning for vulnerabilities in new images.

Same here, SimpleLogin via Proton Pass with my own domain (well a sub-domain of it anyway), works a treat!

Yes, you change your DNS settings so that your domain points to the new provider servers and recreate your email addresses there. You won’t have the old emails unless you backed them up and restored them but the address will be the same.

Been using my domain email more and more for that reason, and the setup with Proton was quite easy, integration is great too. I even set it up with Pass to generate privacy aliases on a subdomain of my domain.