
Custom domain emails can be used to sign in ProtonMail?
So I knew that any of the created proton.me and pm.me email addresses could be used to sign in into protonmail but I did not realize that email addresses using my custom domain can also be used to sign in.
Is there a way to disable this feature? I don't want to have to go through SL because that makes calendar stuff complicated.
Title *custom domain email addresses