I'm also going to going plug #OpenKeychain for a minute.
I have email addresses at my domain now. I also use #GPG keys. I revoked ones associated with my other emails in favour of the new. I also use a password manager that encrypts my passwords with my key. The now-revoked key does nothing. So I don't have access to any of my passwords. Well OpenKeychain has a wonderful backup feature that lets you export a key and import it on your computer. I was literally sick until I found that feature 😌