You can customize this message in config.yml.
Set motd.enabled to false
Welcome!Steve just joined for the first time!
[✦] ⌛ New: loot from drops and bosses now expires 24h after it drops (72h for a full armor set). Use it or lose it! /timers
[EwEvents] HASTE HOUR has begun for 15 minutes! Everyone mines and swings faster (Haste 2).