The scenario is you have domains with a registrar. Typical good practice is that the login to the registrar is an external email address. This way if any issues with the registar, you are not locked out.<p>If you do not have Gmail, Yahoo, Hotmail, any other 3P provider, how do you manage this scenario? The goal is to not have any 3P mail and be self-contained within your own domain and email management.<p><i>Edit</i> This scenario is for a home user that has domains for various projects, purposes however currently uses a separate hotmail, gmail, etc for the login to the registrar.
Provided this question is business-targeted and not home-targeted, use a registar that has support contracts, MFA, etc.<p>Com Laude and CSC Global are the two I'm aware of.