Retrieve the sender email info by the email address, or creates a new one.
If you try to create an email with a name that already exists, this method won't return an error. Instead, the info of the existing sender email will be returned.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.