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Hi ,
I m designing open source solution for one of my customer with approx. 200000 users with 500 MB mailbox size. 50 Mails recvd sent / day.mail size
80KB. I need help for sizing the server.
Mailbox will be different server
POP3 / IMAP will be run on different servers
SMTP will run on different servers.
Bugzilla
Wiki
Source
Sizing 
Linear Mode
