Configuring Postfix in Ubuntu 8.10 Server

[Tafadzwa Kashora]

I am an Ubuntu newbie and have been asked to configure Postfix as a
mail server, for a University setup!! What is the best  way to go
about this? My knowledge of mail servers is limited to Groupwise 7.0
as this is the only mail server I have used.

I have heard of Squirrel Mail, how does it compare to Groupwise and
how do i link it to Postfix? Are there better OSS than Squirrel Mail,
Kalpish mentioned Exim, dont know much about it? I am going to run the
Ubuntu 8.10 server in Vmware Workstation or Virtualbox!!

What I  want to know as well, is what is the next step after i type
sudo apt-get install postfix?