This is a way to do research on an email address to see if the person
is legitimate or not. Now, the free part of these services gives you limited
info. For example sometimes you get the location of the service provider
which tells you nothing. Also you have to be aware that sometimes people
hide their IP thru proxy services. So take this one with a grain of salt it may
or may not be of help to you.
then check the ipaddress