How to send with multiple IPs?


I have always sent my mailings from one domain and one IP. So how do you send emails from multiple IPs?

Do they all need to be different domain names and different from addresses? Or is there a way to have one domain mail through multiple IP addresses?
@Vroom - in mailwizz you can create different delivery server for each IP and then select how you want those servers to be used, basically sending from different ips.
Does each server send from a different domain name and from address? I haven't had any experience with setting up load sharing on servers, so have no idea if you can mail from multiple IPS on the same domain (same from address and domain, different IPs).