We need cluster system for all services (web, mail, dns...).
As a Server Administrator, I want a WHM/cPanel Mail Only version of cPanel & WHM, so that I can ease the load on my main server.
As a servers and datacenter administrator, I'd like to separate email servers from hosting servers, so that I can have a hosting farm and an email farm.
I see many advantages here:
- less hosting server load
- less bandwidth usage in web servers
- faster web rendering
- change/move hosting not affecting email service
- more specific firewall and security policies for each cluster