Messages sent from discord to in-game chat channels such as #global, #trade, #recruit do not seem to have any limit. As such, when someone types a long message on discord to these channels, the messages appear in game as a huge message with multiple lines. This differs from behavior from non-discord messages that do have a character limit.
I would like to recommend that messages sent from discord have a character or line (2-3 lines) limit when displayed in game.