Is there a Mod for internal E-mail system??

[RC-Central]

I am running a forum and I was wondering how I can use vBulletin 4.1.3 to automatically create an Email account for each person that registers?? So say a registered user (BillyBob) wants to send an email from his forum account (http://RC-Central.com), he can do so (BillyBob@RC-Central.com). Please LMK if this is possible and how to set it up. I run my own server from home so nothing is remote, all /local.

P.S. I hope to have 1,000's of users (One day in the far distant future..lol) so I need an E-mail system that can support it. I know my server can (I think). I am running Windows Server 2003 R2 Datacenter Edition SP2, WampServer 2.1

Thanks vB users for all of your support!!