How can I protect my e-mail if my e-mail account is not a Google-account, nor an outlook-account

I recently installed bitdefender total security. Every day it suggests to protect my mail, but, when I click the link, the next screen asks me to choose between an google- and an outlook-account. My e-mail is handled by another provider, and my e-mail-addresses are in my own domain?
What should I do to get the promissed protection?

Answers