You can adjust the highest priviledged port (at least on FreeBSD). It's convenient to set that to 79 and let regular users listen to http without needing root to listen.
ssh and smtp generally need root to do their job, although maybe you could find a way to deliver mail to users without it. If you want to run user based dns or others, you could set the priviledged port even lower.
ssh and smtp generally need root to do their job, although maybe you could find a way to deliver mail to users without it. If you want to run user based dns or others, you could set the priviledged port even lower.