Email action not working

Summary:
Hello, I created an email action. When I executed it in my quote, the sending was not completed, and in the error log, I saw the following error:
[ERROR] - Error occurred while attempting to send an email: The email '' was not sent, as the domain 'an****@****.com' is not supported. Please contact your company administrator.
Do you know how to fix this error?
I don't know if I need to open an SR or if I configured something incorrectly.