Freebsd for mail servers.

[Carstea Catalin]

I want to start a fresh instalation of freebsd 6.0 for my mail server.
1. I want to use many hard-disks on this server with one directory
over this disks .I want to use also RAID - software.
    This directory will contains mailboxes of users. <<EX.: Postfix -
mail server>>.
2. If it is possible, how i do this?

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Any help would be greatly appreciated.
regards,
Carstea Catalin