We are currently running 2 clustered Barracuda 600's and they cannot always
keep up with the current peak load.
Been there, done that, last autumn, with an mail user whose Barracuda
400 was totally overwhelmed, delaying msgs by up to 12 hours.
Keep your 600s and add IMGate in front as MX.
IMGate will reject, typically, 70%+ of the inbound, allowing those
expensive 600s to keep up with the much reduced volume and keeping
working for years.
IMGate can also be set up to distribute evenly 1/x of the passed
traffic to x number content-scanner machines. For your volume, 2
IMGates as equal preference MXs is recommended.
Len
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