Configure Test SMTP Email Servers
While working in your development or testing environment, we recommend that you use a test SMTP server so that you can:
Check for successful email deliveries.
View how emails you sent appear to recipients prior to go live.
You can either set up your own SMTP server or use a third-party service. Once you have either your own SMTP server set up or a test service available, you provide its credentials the way you typically would for a custom email provider.
Auth0 does not allow certain "false" domains commonly used during testing. Use real email addresses to avoid disruption or errors.
Here are some third-party email testing services: