[faster]

Mostly the same here. Physical servers in a colo since 2000, same IPs the whole time. I host a few domains for friends, too. It's really not difficult to keep email running smoothly. I look at a summary report every day (less than a minute, normally), and I have a daily cron job that builds a black list based on whatever list looks good to me when I decide that the one I'm using isn't catching enough.

I have a spreadsheet where I compare what it would cost me to do this in a cloud or on VPSs, and though there are some squishy factors (I enjoy messing with servers occasionally, when I have to visit the colo I also visit old friends in that area, etc.) it's still cheaper for me to keep my physical servers in my colo.