PlusAuth provides Multi-Factor Authentication with SMS, Email and Google Authenticator.
Go to Dashboard > Multi-Factor Authentication and select one of the strategies . If multiple strategies enabled, user will be prompt to select one of the strategies.
After you configure your email provider you can enable Email as MFA strategy from the switch located on top right . For configuring your email provider have a look at Email Configuration
For using google authenticator, all you need to do is enabling it from the switch located on top right.