At the moment is looks like it is only possible to configure IPs that global server uses to send out going emails.
However, I would to be able to assign a domain a specific IP to send from/receive to. To isolate that domain activity from other domains on the same server.
MTA / Outbound / Routes → delete default “Remote Delivety (MX)”
MTA / Outbound / Routes → Create route “Remote Delivety (MX)” and Name mx
MTA / Outbound / Strategy → Connection if sender_domain == “domain2” then “name”
MTA / Outbound / Connection Strategies → Create strategy (fill name, EHLO Hostname, Source IPs)