In my experience the time sink is high when you're setting it up. Then it's mostly zero. Though I'm not sure I'd recommend to invest into it. Back in the days

In my experience the time sink is high when you're setting it up. Then it's mostly zero. Though I'm not sure I'd recommend to invest into it. Back in the days that unix knowledge was valuable and setting up your own e-mail was a good way to learn thing or two. These days those skills are useless for most people, so I'd say use hosted mail and spend that time learning some more valuable skills.