I work for the Navy. I'm currently developing a new Training Network with Windows 2003 Server. I would like to setup Imail for approximately 50 thousand users. I was wondering:
How many servers do you suggest for this amount of users?
How many processors per server?
The key here is going to be the average number of E-mails sent/received per day. Those 50,000 users could be sending/receiving anywhere from 1,500 to 1,500,000 E-mails/day, depending on your situation. A single server would have no problem handling 1,500 E-mails/day; at 1,500,000 E-mails/day you would need to carefully determine your needs.
How much RAM per server?
The RAM isn't too important -- 512MB should be plenty (unless you have other services running on the same server, such as IIS, which I'm guessing you won't in your situation).
How many simultaneous connections per server can I expect?
I believe that IMail typically handles about 50-100 simultaneous connections before it starts refusing new connections.
A little background, I am currently using:
Dell Poweredge 2650
Dual P4 Xeon 2.8 GHz
2GB Ram
3x32GB SCSI Drives
This should be able to easily handle up to about 500,000 E-mails/day (complete with virus and spam scanning), if the server is well maintained (things like optimal partitioning and defragmentation are important at that volume).
-Scott
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