[Dovecot] Dovecot strong or not for a big Webmail architecture

[John fistack]

Hello,

Do you think Dovecot could handle millions of active users in a big architecture ?

This cluster could be for example (each server is a bi quad Xeon 2.66 Ghz) :
- 40 Dovecot servers 
- 4 LVS
- 20 Apache+PHP
- 2 Openldap
- 20 Postfix + ClamAV + SpamAssassin
- 1 NFS Netapps

For millions of user it could be multiple different clusters of 40 Dovecot servers with 1 Netapp for each cluster.
I want to work in NFS.
I've experimented problem with Cyrus and NFS on Netapp.
I want to use maildir, I can manage limitations of inodes with Netapp.

I know webmail.us use Dovecot, what is the most big dovecot architecture known ?
Do you think Dovecot can handle 1 million of active users in a good architecture ?
Do you think it's a good solution to use one synchronised local Openldap on each server Dovecot ?
Do you think It's possible to use Postgresql or MySQL instead of Openldap ?
Are cyrus or courrier-imap better solutions ?
Someone say "Zimbra is highly scalable and fast", I think Zimbra could be to heavy in this architecture, is Dovecot scalable ?

Thank you for your ideas.

Regards.

John Fistack


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