There are lots of free reverse email lookup services online. They provide a search engine, you provide the email address. They search for it and present you with the results. Some service providers include Spokeo, Spytox, ThatsThem or InfoTracer and others.

How can I find a dating site by email?

A reverse email search look up allows you to find people using their email address for dating sites. Reverse email lookup services are used to get names, usernames , age, relatives, images, area code once you enter an email ID of someone to check whether they are in dating websites.