ACL supported IMAP RPM

[Brook Hurd]

I am looking for an IMAP tool that supports ACL in the Linux Redhat
Enterprise 3 environment.  I read a lot about cyrus-imapd but I cannot
find a rpm at rpmfind.net or rpmseek.com that will build without
updating my glibc rpms to 2.3.4 which is not currently available in the
Linux Redhat Enterprise 3 environment.

Does anyone have a suggestion on an IMAP tool that will support ACL
using tools like Squirrelmail?
Is it possible to make the Redhat Enterprise 3 release IMAP server do
any of these functions?

Thanks,

Brook Hurd