You have received an email from a person with whom you have never interacted earlier and thus, before you take the conversation forward,you would like to do a bit of research for that person on the Internet. How do you do this without directly asking the other person? Google is the most obvious place for performing reverse email lookups but if the person you’re trying to find doesn’t have a website or if they have never used that email address on public forums, Google will be of little help. No worries. If you only know the email address of a person and nothing extra, here are some ways that may help you uncover the identity of that unknown email sender. Tips for Reverse Email Search. Open the header of the email message and look for lines that say “Received: from” and are followed by an IP address in square brackets. If there are multiple entries, use the IP address mentioned in the last entry. Now paste the IP address in this trace route tool and you should get a fairly good idea about the approximate location of the email sender.