From FreeSpace Wiki
send-message-list Sends a series of delayed messages. All times are accumulated. 1: Name of who the message is from. 2: Priority of message ("Low", "Normal" or "High"). 3: Name of message (from message editor). 4: Delay from previous message in list (if any) in ms Use Add-Data for multiple messages. IMPORTANT : each additional message in the list MUST HAVE 4 entries; any message without the 4 proper fields will be ignored, as will any successive messages.
Used to send a list of messages.