I migrated from Outlook’s custom email domain to Apple’s. It took a couple of changes with the DNS records and exporting the emails from Outlook. In Apple, you

I migrated from Outlook’s custom email domain to Apple’s. It took a couple of changes with the DNS records and exporting the emails from Outlook. In Apple, you can change the login details for your account to your custom domain. Sounds like a project though - I also have a paid Bitwarden account which I use for my 2FA codes. Works well for me