Self-Hosting Email: Mailcow vs Mail-in-a-Box, and the Deliverability Problem Nobody Warns You About
Every other service in this stack either works or it doesn’t, and when it doesn’t, you get an error message. Email is different. You can run a flawless mail server, correctly configured down to the last header, and have every message you send quietly vanish into someone else’s spam folder, or get silently dropped before it even gets that far, with zero indication anything went wrong on your end. That one property, failure that’s invisible by default, is why self-hosting email has a reputation as the homelab project that eats the most time for the least reliable payoff. It’s worth understanding why before picking Mailcow or Mail-in-a-Box, because the software choice matters a lot less than most guides make it sound. ...