I've looked all over the place and can't find any dedicated mail servers. Im thinking about just buying a raq 4 from rack shack. DO you think a normal rack could handle the server load?

Many places provide dedicated mail services. I'd recommend a place that kind provide full optimization and tweaking support.

<<EDIT>>

You didn't exactly mention *what* server load, but in general, mine seems to do fine handling email. I don't sent out millions per day, but I don't think it would be a problem.