More times than I care to remember, I’ve had a conversation with someone trying to specify an email system that went like the following:
Them: I need to build an email server using Sun equipment that will handle X number of users. What hardware should I buy?
Me: Well, that completely depends.
Them: On what?
Me: On their usage profiles. How many messages does each person send and receive each day? What is the average message size? How fast is your Internet connection? What percentage of your peak day’s total traffic occurs during the peak hour?
Them: I don’t know.
Me: Then I’m afraid I can’t help you very much.
Them: Well, can you give me a rough estimate?
Me: Sure, you’ll need a machine somewhere between a Sparc ...