

Stalwart and other similar projects might be decent to use, but they lack one detail which is a deal-breaker for me: maildir format for storage. It’s really easy to move between installations and even between different servers, easy and efficient to back up, doesn’t require any fancy databases or anything to be in order and it just works. Sure, it might need few megabytes more memory and search times might be couple milliseconds longer but it just works. My personal maildir has been around from at least 2008 and it’s moved around between servers multiple times without any hiccups ever.

I do excactly this too. My personal domain has been around since 2008 and my setup has a few domains from friends too. I’m running ispconfig to manage the whole mess and it’s really not that difficult. Getting your server removed from blocklists every now and then is annoying but at least my emails aren’t feeding some marketing machine and, at least for the last 24 hours, my service availability is better than Microsoft can do.