Can an Xserver scale to this level?

A client has asked me to investigate what it would take to send out 40,000 emails to their customers. They would like them all sent out rather quickly (4-8 hours).
My first thought was an Xserver with postfix and mailman.
Does anyone have any experience with using an Xserve with this size / volume? Which one should I go with? Cluster?
I would want it colocated somewhere. Still trying to find a good home. Not all really support gig-E.
Appreciate any advice I can get.
iBook   Mac OS X (10.4.6)  

...Or - dare one utter the words - Linux/BSD? For the cost of one basic XServe/cluster node, you can by two dual-CPU x86 servers with RAID drives and tonnes of RAM. That amounts either to twice as much processing power, a redundant system in case one falls over, or just a much smaller investment.
Don't get me wrong - XServes are great things if you use them for something that they excel at, but they're not necessarily the best server for everything, ever. Another post I recently read was from someone who wanted an XServe to share his home internet connection and limit his kids' web access. It seems like some people think "server = XServe", when in fact there are a number of good options, some better than others at doing certain jobs. Windows servers are better at running Windows networks, and when it comes to open-source, standard networking stuff like e-mail servers or Apache/web stuff, most UNIX systems (e.g. Solaris/BSD/Linux on Dell/HP/Sun/generic hardware) do the same job for a much smaller cost. OS X does have a great GUI/management interface, but if you're running it headless that doesn't make much difference.
I'm not saying 'don't buy an XServe because Linux is better' - far from it, I personally avoid Linux wherever possible (though BSD does a good job), but think of it this way - if all you want to run is stuff that you can get on any UNIX system, like e-mail/web servers, what's the advantage of spending £2k on an XServe when you could buy a similar system for £600 or a much better one (in terms of hardware spec) for £1000? What does the XServe do to justify that, that a generic UNIX can't do?
</rant>

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