How many email users can one server handle?

How many webmail users (house solution being developed right now) do you think one server can handle? 5k, 10k, more?

I'm talking about a server like this:

Dual AMD Opteron 244 Processors
1 GB ECC DDR SDRAM - could be 2-3 GB
1200GB Bandwidth (100 Mbit/sec port) - it might not be enough right?

Waiting for your comments How many email users can one server handle?

Thanks

 

 

 

 

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