Home now, unplugged the physical server, and my email still works, so that's a good sign. Reenabled the fetchmail cron job. I think I'm good to go...
Going to give it a bit then I can officially turn it off and decomission that box. The cpu is old (core2quad) but does have VT-D so it's going to be nice to have a spare box I can test virtualization environments on. I want to look at moving to something more open, so I can eventually do clustering. Maybe Proxmox or something.