We have DiscordSRV so you can communicate via discord to the SMP players even when offline.
There is also a plugin called BetterNetherite so you have to craft Netherite Armour from just the ingots and not upgrading. Every player has a limited 15 lives, and if they lose them all, they are permanently banned from the SMP.
There's a whitelist but it's pretty simple to get in, and you just need to list your username on the discord and wait for an admin to add you.
The only rules are not to hack, no lag machines, and no abusive bugs/glitches. You can grief, but don't go over the top as you might get killed by another player till you are banned.
NO LAND CLAIMING
Plugins installed on server: Dynmap, Essentials, DiscordSRV, OpenAudioMC, HardcoreLife, Partychat, BetterNetherite, ClearLagg, Vault, Luckperms, Worldedit, WorldGuard