[Exim] Exim for 6M users?

Afternoon folks!
Just been asked by my CTO to prepare some guidlines for a mail system to
cope with 6 million users, capable of coping with 2 million simultaneous
users without blinking too hard.

My initial thoughts are along the lines of splitting the MTA function
into:
1. incoming mail
2. mailstore
3. outgoing spool
4. pop3 access

All the above would live on separate machines/clusters of machines.

Any comments? I know someone on the list had a white paper on a similar
scenario done with Exim 3.x - if that person would let me know again
where it is I'd be most appreciative!

Later
Konrad



--
***********************************************************************
*
* Konrad Michels
* System Administrator
* Surfkitchen Limited
* Abbey House
* 1650 Arlington Business Park
* Theale
* RG7 4SA
* United Kingdom
* Tel: +44 118 929 8079
*
***********************************************************************