[CentOS] How to size an email server to handle 5 million emails perday

[Feizhou]

Mike Kercher wrote:
> On second thought, are mails being delivered locally or are you relaying
> to Exchange (or similar)?
> 

It cannot possibly be used for local delivery. Do you have any idea what 
it takes to handle 5 million local deliveries daily?

I spent over three years managing a system that delivers more than 2 
million emails and handles on average 200 million smtp transactions on a 
daily basis and you do not use a single box for this sort of thing.

Delivering 5 million emails daily with a single box has got to be an 
outgoing box.