I recently threw together a simple and rough script that can be used to send many messages to a friend in rapid succession on a mac:

MESSAGE=$1
TIMES=$2
BUDDY=$3
echo "$MESSAGE"
for ((i=0; i < $TIMES; i++))
	do
		osascript -e 'tell application "Messages" to send '"${MESSAGE}"' to buddy "'${BUDDY}'"'
	done

just make sure to put the above in an executable file, and you can pass the arguments as such: ./FILENAME.sh '"uh oh, something might be broken"' 1000 1234567890 This will send the message “uh oh, something might be broken” to the phone number 123-456-7890* one thousand times in rapid succession. *phone number might need to be a contact

Remember to be responsible! Don’t abuse automation tools or you might end up being blocked or banned.

Applescript is really cool, too!. You can automate a lot of things on a mac using it like responding to messages, creating reminders, etc. Definitely worth tinkering with if you have any interest.