SUGGESTON FOR: HIGH END MAIL SERVER

[nilesh vaghela]

Dear All,

We are in planning for high end mailing services the criteria is:

# starting with 2,00,000 user initially
# can be reach upto 5,00,000 users within 2-3 years.
# Need web access
# POP3 / IMAP/ and SMTP services
# Redundancy for server.
# Service monitoring and alarm for any critical failure.
# Antispam and Antivirus services.
# Backup obviously..

What could be the server or servers config ( dedicated number of POP3/ IMAP
and SMTP server, Dedicated Antivirus and Antispam server / servers,
dedicated server for web access etc ).

Which is the best MTA to handle mail services ?? ( Qmail, POSTFIX -- or any
other )
Which pop3 / IMAP server ( thinking for cyrusd )
What is the best approach for antivirus and antispam.
Which could be the best candidate for web access ( squirrelmail, horde ?? )
Service monitoring NMS ( OPENNMS , negois ??)

Suggestions are welcome.

Any body handling this kind of setup please give suggestion so can plan for
the hardware and selection of the services.


-- 
Nilesh Vaghela
ElectroMech
Redhat Channel Partner and Training Partner
74, Nalanda Complex, Satellite Rd, Ahmedabad
25, The Emperor, Fatehgunj, Baroda.
www.electromech.info