Configure External SMTP Email Providers
Auth0 allows you to configure your own SMTP email provider so you can more completely manage, monitor, and troubleshoot your email communications. Auth0's built-in email infrastructure should be used for testing emails only. You can only configure one email provider which will be used for all emails.
Auth0 currently supports the following providers:
You can also configure a custom email provider such as Gmail, Yahoo.
You configure external email providers at Dashboard > Branding > Email Provider.