Somewhat related story time! In the early 2000's my main business was web hosting. It paid the bills but never made me enough to really invest in it. So it kept running, sitting in a colocation space. In 2005, having the mail server hosted on my web server was becoming a problem, so I decided to put it on a new server.<p>I chose a 1.42Ghz Power PC Mac Mini. I installed Linux, and was very happy with how well it worked, how tiny it was, and how it took a fraction of the the rack space that my web server and other servers took. I thought I might even just use those in the future.<p>Fast forward a couple years, and the load started increasing. I had used XFS for the mail partition, it ran Qmail and used used Maildirs which tended to accumulate thousands of files per mail directory, and the server was starting to choke. I also avoided rebooting it for years. If I remember correctly, by the end, the server had an 6 year uptime because I was so scared that rebooting it might brick it. But I had a major problem: this Qmail+Vpopmail+SpamAssassin+[dozens of custom tweaks] install had accumulated so many custom hacks, tweaks and patches that I never had confidence that I could do a real downtime-free cut over to a new system without a barrage of complaints.<p>So I put it off. And I put it off. Fast forward to about 2013 and I decided enough was enough, so instead of doing a fraught cut-over, I just ended email service. Problem solved. Best choice I ever made.<p>Needless to say, I avoid overly complex, patched configs now.