Ah okay. I wouldn’t know. I played Minetest instead of Minecraft. And the community there seems to be nice albeit a bit small. I learned a bit of Lua and contributed some smaller fixes to some mods. But I guess the gaming and modding community for propriety games is a bit different than the open source community.
You could use some containerized mail server like Mailcow. They’re pretty alright to set up and should work fine for low volume. At least in my experience. Unless you don’t want to deal with mail yourself, then you should maybe consider a paid service. But I don’t have any experience with those.