＊ First, log in as domain administrator to enable Two Factor Authentication (2FA)
Log in to SmarterMail, go to [Domain Settings] > [General] > [User Options] > [Two-Step Authentication] Enable and Save.
After domain admin setting completed, login SmarterMail as individual mailbox user.
Goto [Setting] > [Account] > [Two Step Authentication] > [Enable]
Verification Methods: Authenticator App (You may use your Andorid or iOS device and install Google Authenticator or Microsoft Authenticator )
Recovery Email address: in case of problem, you may use this email for recovery