My use case would be creating one AWS SES or Sendgrid credential that is authorized to sending mail for an entire domain, and then a mail server like mox would

My use case would be creating one AWS SES or Sendgrid credential that is authorized to sending mail for an entire domain, and then a mail server like mox would then further authorize which users could send emails as who (and probably filter by only allowing the correct email in the From: header for example)