Requires the library mod Hybrid.

Chat History is a mod (a Hytale Java plugin) that saves chat messages on the server. Whenever a player re-joins the server, those saved chat messages are sent to their chat box. It helps remembering what you last talked about or what you were doing before logging out.

By default, a player only receives content they've seen before when they were online. If you'd like players to see the chat history when they were offline, enable globalServerChatHistory. The history is limited to 50 messages, this can also be changed in the config.

Configurable: ( how do I configure? )
globalServerChatHistory (default = false)
messageLimitOnLogin (default = 50)

Showcase:
Whenever a player joins the server, their chat box is updated:

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You may freely use this mod in any mod collection, as long as the download remains hosted within the CurseForge ecosystem.

Serilum.com contains an overview and more information on all mods available.

Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!