A reverse lookup allows people to work backwards to find information.Most reverse lookups typically involve using pieces of information like an image, phone number or email address.
Every computer that gets online has an Internet address, and most of the time (not always), you can search the header of the email you've received to get it.
Once you have that IP address, plug it into a simple IP address lookup tool, and you'll be able to determine the general geographic area of where that email originated.
Finding someone's email address is not usually accomplished with just one search unless the person you're looking for has put their email address on the Web somewhere.
The best way to find someone's email address is to start with a wide search and then gradually narrow it down using a variety of search tools.
Unfortunately, if someone has not publicly posted their email address online, it is quite difficult to track - especially if they do not use their given name as part of their email address.