Effin fantastic idea actually, gonna go do that now, thanks!

Hybinet: Thanks again for your help in this. I now have the board emails working without issue. However, if I later do want to go back and setup an SMTP server to begin creating email accounts, will it interfere again? I know it is possible to have both mail systems working in tandem, just want to be a bit more careful next time round.

As long as you configure it properly, it should be fine. Just test it a lot. (Choose one: Postfix or Citadel. But not both at the same time.)

But I'd very much recommend outsourcing your e-mail accounts to something like Google Apps. That will save you a lot of time and resources. Also, when your web server goes down, you'll still receive e-mails.