What hardware to handle this

[Jim Bartus]

I'm looking to redo our companys mailserver setup, and I want to move 
from our current system of POP3 to an IMAP based system.  I've done a 
fair amount of reading and Cyrus looks like the right answer, so I was 
hoping you guys could help me out with some final details.

I have approx 500 users.  Of which probably only about 300 will be 
connected at peak times, but they will be consantly connected in the 
"check for new mail every 5 minutes" sense.  Overall the system will 
deliver about 25 - 40,000 messages a day.  There will be a seperate SMTP 
server delivering to this via LMTP, and a seperate webmail server 
connecting in through IMAP.  Quota's will be set around 250MB and the 
use of sieve filters will be enabled.  All with authenticate against our 
LDAP server (its not purchased yet, but it'll be novell edirectory).

My major question is what kind of hardware will cyrus require to handle 
that level of load?  Currently we were planning on buying a dual 3.0GHz 
Xeon system with 2GB of ram running RHEL 3.0.  For storage it'll connect 
via HBA to our EMC CX500 storage array.  Will that do it?  Does anyone 
have anything similar setup?

One other question, is it possible to have the one IMAP server listen 
for both encrypted and unencrypted connections?  We'll then use firewall 
policies to make sure anything from outside the lan is SSL'd.

Thank you,
jim
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