Email marketing

I WOULD LIKE TO KEEP THIS ISP BUT ALSO WOULD LIKE THE ABILITY TO SEND AND RECEIVE UNLIMITED EMAILS.

Company has three departments, support, sales and marketing. Support is on the first floor with 28 Workstations, Sales on second floor with 30 workstations and marketing on the second floor also with 10 workstations. Each workstation needs to connect to internet, email and company’s internal internet. Also, each department as its own applications that need to be connected throughout the department.

What kind of LAN could be used? Where would the hubs, routers, switches and bridges be located? Hubs and Switches should have a max of 24 ports right? A server is also needed for the email and intranet.. right?

Please help?

in business?