Within the next week or two we will be purchasing a new mail server. Due to budget constraints that might be a refurbished server. However, while we do want to be economical, we do not wish to under-buy.
Current average stats:
ldeliver: 22,000 rdeliver: 5,000
Assuming that you want to be able to quadruple the volume (including both growth in legit mail and spam), you would be dealing with around 100,000 E-mails/day. For that volume, a single 1GHz CPU should be able to handle the load of mail (pushing the CPU usage towards its maximum, though), including spam/virus scanning.
Given the pricing of CPUs and RAM, I would recommend a minimum of a 1GHz CPU and 512MB RAM -- but more CPU if you can afford it, to allow more room for expansion later. 256MB of RAM might do for now, but going to 512MB would be best.
-Scott
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