Hi @vitalina ,
Welcome to the Auth0 Community!
This FAQ outlines the same error that you received.
When your SES account is in “sandbox” mode, you can:
- Only send from verified domains and email addresses, and
- Only send to verified domains and email addresses
In order to send it to anyone else, you must move your account out of sandbox mode by contacting AWS support and requesting it:
Hopefully, it could be helpful for your case!