My email was hosted with Register.com as well. Not sure who to go with for email hosting, i use them to just forward to another account, so I do not need anything fancy, just a basic email that can forward. They are convenient, so I do not have to use my full Gmail email address, I can use email@example.com and so can my daughter with her email. I bought the domain way back in the 90’s and my knowledge of how I set them up has faded over the years.
If you have a good email provider that just has the essentials I would appreciate it.