What is the function the Sending domains


Shipping domains, what are they?
Used to authenticate or to limit the use of unauthorized sender.
Hello and thank you for your prompt response, here I have you another question. Would there be a way of limiting a certain amount of senders per customer? Ie for example: I want my client can only use a poster with domain a.com Is it possible?

Thank you.
It is possible by using domain policies for delivery servers and in that policy allow sending only to certain domain(s) and assign those servers to the customer ;)