A family of System Center products for managing incidents and problems.
You can setup a Login Only Alias and disable Sign-In for your current email address. Then, if all the Bad Guys have is your old alias, they get "This username has been turned-off for sign in" at the very first step of the logon process and can not continue and you never get a MFA verification email.
For detailed instructions see the Answer by "Hornblower409 on Feb 27, 2026" in
https://learn.microsoft.com/en-us/answers/questions/5789093/i-get-a-few-2fa-notifications-from-canada-daily-us