Is it possible to use a third-party email provider for Two-Factor authentication in ADManager Plus

Solution: Yes, third party email address can be used for Two Factor authentication.

While logging to ADManager Plus for the first time after enabling 'One time password via email' option in Two Factor authentication, the technician/user is prompted to enter the email address which they wish to use for the authentication purpose. In this field you can specify any email address including a third party email provider like Gmail.