Why isnt email tracker pro correct?

few days ago somebody tried scamming me thru my email so i downloaded email tracker pro to track scammers im already into the internet stuff like tracking, hacking, and all that junk for fun and to learn it but this program is supposed to show ip adress and ports and other stuff by using their email and sometimes the ip adress is right sometimes its wrong and i dont see why seems like the program is unreliable. does anybody have any other suggestions on a better program thats free preferably or what might be wrong?