Still working on new mail servers for better spam control and over-all functionality. Working with Ubuntu 14.04 LTS rather than Fedora and so far it’s going much more smoothly. Ubuntu builds low latency kernels as part of the distribution so don’t have to do that by hand, synaptic is far better than any of the package installers provided with Fedora.
I’ve got most of the necessary pieces installed on one new server, now just have to configure everything. Once I get one setup, it should be easy to clone the new configuration.