Internal mail service

[ViN's]

I've 7 PC's on my network. I've to setup an internal mail service, to send mails inside the network. I've installed Fedora 12 on one machine and the rest run's on Windows XP. What all packages do I need? How can I configure it?

Thanks.

[Keldorn]

Look here:
postfix.org
dovecot.org
You will find instructions over there to. But if it is local servict - do you really need a email service? May be jabber will be more sutiable?

[ViN's]

We only have a dial up internet connection. For security reasons, internet is available only to one machine.