I dont' like the idea of pop up windows at all, but a message would be fine. The pop up window idea is a pain in the butt, especially when you use .wingman simply to find a pilot who just advertized he's a goon requesting escort.
There should be menu on the clipboard to edit a list of pilots with checkboxes for each containing things like : squelch VOX, squelch text, squelch check 6, ignore .join, disallow that player to .wingman you, show in Squad colour, show in X colour, etc. This list should be stored and kept for each log in.
Several people have requested a system that allows you to permanently squelch sombody, and this system would allow that, adnd more.
Who was the guy who was spying on you? That's just wrong. He should be sent to fly with the bish for that for his punishment.