What you did ask is how to add email to it. Most won't set up their own email server so the answer is simply: install an email server. There are dozens to choose from and you must be able to choose and set these up since you will be supporting this app.
Please how do i set up an intranet. we already have an existing server, with a domain name and all that. i need to set up outlook, so that members on the domain can send and receive emails to each other. what do i need to set this up, and how. its urgent pls