how 2 determine email server spec.

How to determine email server hardware spec if number of user increment is like this:
Y1 - 3,000
Y2 - 30,000
Y3 - 100,000
Y4 - 190,000
Y5 - 250,000
Y6 - 320,000
Y7 - 400,000
Y8 - 500,000

and every user will be given 10Mb each. user can assess email thru webmail or desktop application.

Thanks

 

 

 

 

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