Kernel Memory limits. How much can it usefully use?

I just wanted to check something.
Obviously the Linux kernel can handle a lot of memory, but the question is how much can it usefully use before it needs to be specially compiled?
I need to build a server to clean email, and because it is very very busy, (well the last one was and so is its stand in) it will need 4GB of RAM as an absolute minimum but I would like to put in 8. If I go for 8, do I need to rebuild the kernel?
Kind regards
Benedict White

If you install Arch64 and use the normal kernel package -- no. You won't touch the RAM limit for some decades to come.

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Kernel Memory limits. How much can it usefully use?

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