UnlimitedChatMessage (UCM) removes the 255 character limit from the chat editbox allowing you to send extra long messages into chat. It does this by breaking up your outgoing message into smaller 255 character messages.
Ever try to post a dungeon walk threw into chat but can't paste the whole text into the edit box? UCM solves that problem.
If you want each line to be it's own message. type /ml before pasting your message.
RealID users:
UCM does not support unlimited length RealID whispers/conversations. When typing a message for RealID the chatbox will return to default max character limit (255).