How Can I Receive Messages to Multiple Emails at Once?

You can get requests from feedback forms only to one email. It's not possible to add another one.

You can also use the function of mail services, which allows you to collect emails from other emails. So you can set up collection of requests from your site to the second email not in the builder but in the email. Requests will come to one email and will be collected in the second one by the mail service.