I realize this thread is off OT for Imail, but I was wondering how much hardware it would take to handle 750,000 emails
750K legit msgs accepted, or 750K total msgs with 90+% rejected?
and 5000 mailboxes a day?
number of mailboxes is irrelevant. The number of msgs dominates, followed by disk partitioning and disk maintenance of the mail queue and mail store sub-systems.
I'm biased for 2 boxes, but I think to expect a one-box Imail solution with 3rd party add-ons doing full anti-spam and content-scanning, esp if ALL msgs are completely acceptd (DATA command) before reject is done to hanlde 750K/day of anything is asking for trouble.
And for that kind of volume (=importance of NOT stirring up so many users with poor email operation), you really should have fail-over through MTA redundancy, eg, a rock-solid front-end MX (eg, IMGate) to hold legit mail when the higher-maintenance/more-down-time back-end mailserver+stuff is off-line.
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