Yes Hawkman is HIGHLY resistant to telepthy, as people who have tried have gotten overwhelemed as all of Hawkman's past lives are all in his head so its like hundreds of voices at once which is to much for some. Doesnt mean he is completly immune, but its enough to fight Sauron (which isn't true telepathy anyways though).
😖hifty:
http://i125.photobucket.com/albums/p68/DCHawks_photo/JLA117-19.jpg