[CentOS] Rozwa¿ania odno¶nie storage?

> Hi. Currently I am dealing with a cluster of mail, [...]

For a highly scalable open source mail solution, have a look
at the Cyrus IMAP (+POP) mail system, specifically the Cyrus Murder
configuration.  I don't know of any comparable open source 
system (and I would stack it against commercial solutions, too).

<http://cyrusimap.web.cmu.edu/mediawiki/index.php/Cyrus_Murder>

Devin