A weird use-case rises apon me. Soon I will be given the task to configure a dedicated server (with one public IPv4 address) in rather a weird way. For starters, there will be many domains.
My vision is to create a container/VM machine (haven't decided yet), each will be assigned to a domain.
Each container/VM with a domain is going to have it's mail server. And now comes the big question. Is it possible, to set up multiple mail servers on a single IPv4 address?
Linux/GNU - based OS is going to be used.