I recently plugged my iPhone to my Mac. Ever since I did that, every time that I text on my iPhone it shows an icon pop up on the Mac screen, however I am not set up through messaging on my Mac. I am wondering if there is a way to stop the computer from showing that I am typing and showing who I am texting. It does not show conversation or any details, just who I am texting. It is pretty annoying.
Handoff turned on under
Handoff & Suggested Apps on your iPhone.
Handoff and you shouldn't see it anymore.
Though I would be more concerned with the message to "ransom"....