[dsr_]

Banning a server because it won't shut down a spammer is effective.

A server that doesn't take responsibility for its users will soon find itself shouting into the void... as long as enough admins react.

Gmail is the largest source of spam because other mail systems won't ban it because it's too big.

[ilyt]

Sooo the server is banned, problematic users move off it coz they can't get anything from outside on it and... move on

How that helps ? It just makes impossible for small server admin to take vacation...

[dsr_]

Small server admin should not have open enrollment. Start friends-only. Quite possibly stay friends-only.

When comfortable, change to friends-of-friends.

And if you're going to grow past being comfortable with everyone on your server, have a backup admin you trust.