It's bad out there when it comes to hosting your own email server. This blog post shows somebody's experience in detail, and it's worth reading. https://cfenollosa.com/blog/after-self-hosting-my-email-for-twenty-three-years-i-have-thrown-in-the-towel-the-oligopoly-has-won.html

It's all so sad.

Every community should own their own communication infrastructure, or they don't actually own the community. It can disappear in a second. Matrix, Rocket.Chat, Mattermost, IRC, whatever. An online community relies on the connecting tissue, so if you care about your community you need to own it.

Pleroma, Owncast, Nextcloud, an internet radio station, and a couple web sites.

My vote is in!