Can it be done?

[Guillermo Villasana Cardoza]

Hello everyone ... I have the following scenario:

I have one Internet IP address .. which I use for my firewall behind the
firewall I have several internal servers... The problem is that each
server will be a different web and mail server...

eg.
mailserver1.domain.com
mailserver2.domain.com
...
etc

Each mail server with it's own users...

Can this be done?
Thanks for all the help
Guillermo Villasana