No longer leaks when running warm (40c IIRC).

Although, if the trans has been running and you ran through the gears, fluid shouldn't be coming out when it's cold either since the fluid expands when warm.

You don't mention it, but the car was running when you did this right? If you do this with the car off you will lose a lot of fluid.

But yes it's possible it's overfilled. Start the car and run through the gears (a few sec in each gear). Then put the car in P, and using a IR thermometer or a scan tool, monitor trans temp. Pull the full plug and either fill (or drain) until there is a very light amount of fluid coming out when the trans is at about 40c.