It appears that we have encountered a service outage for email signups.
See the two attachments.
Check your logs, we depend on your service and can’t have this happening again.
It appears that you may be using Auth0’s built-in SMTP email provider. As stated in the [documentation] (Customize Emails):
Auth0’s built-in email provider is not supported for use in a production environment and should be used for testing only.
For production systems the recommendation is to setup a custom email provider as it will be more responsive, under your control and would help you troubleshoot any issues.
Auth0 allows you to configure your own SMTP email provider. Auth0’s built-in email infrastructure should be used for testing level emails only. By using your own provider you can more completely manage, monitor and troubleshoot your email communications.