It would be great if the autoresponder may switch on for a whole domain
Could you please provide more detail of your request? What is desired usage scenario and expected benefits of this feature?
On a public holiday setting up an autoresponder for hundreds of email addresses for hundred domains is really a difficult task and waste of time.
if autoresponder for a domain is available we can set up an autoresponder for thousands of email addresses for a single domain in a few seconds.