[CentOS] Mail Question

Hello everyone,

Im having a issue that I just cant seem to figure out. We currently are
running an email server Centos 5.6 Postfix/Dovecot with a squirrelmail
frontend. I was setting up a testbed to do a migration to SoGo using
LDAP/MYSQL/POSTFIX/Dovecot. I have everything up and functional but one
thing is giving me an issue. The testbed box will not handle a users
mailbox over 2gb. We are using mbox on the existing server with no issues
at all. I have multiple users with inboxes over 2gb and and archive mbox
file with over 50gb. I have check postfix and made sure that the
mailbox_size_limit = 0
Both are running i686 as returned by the arch command and both are Centos
version 5.6.
Any ideas would be greatly appreciated.
-- 
Bo Lynch