The new IMAP/POP servers have arrived and are being installed. These will replace the current servers which are Dell 2650s running RedHat. The new servers are Sun X4100 systems with 8GB of RAM and a total of four 2.6GHz CPU cores. They will run Solaris 10 as the operating system.
As a side note, once these servers are installed and put into production (3 are actually already installed and in production, we need to install the last 2) our primary core infrastructure (AFS, Mail - including SMTP, IMAP/POP and spam filtering, DNS, LDAP, and Web) will all be running Solaris with just a few minor systems still running Linux. In time and where appropriate, those systems will also be migrated to Solaris 10. Beyond that, we're looking at the possibility of running Linux systems (such as the GL login servers) in a virtualized environment under Solaris (using BrandZ)