Not really, if you have a server that is not assigned to a particular customer, that server will be used for all customers if not specified otherwise (i.e: there's an option where you can force customers to add their own delivery server and where they can't use the system servers to send emails).So the system needs a new server for each customer and then one for transactional emails, right?
Right.Or if I create a server and choose "All" it will be used for all as long as I don't have a customer selected right?