I do not have too much time to invest in reading about your what your site can do so lets just get to it fast. First of all your site showed me where I have been having a problem at and instantly I knew who it was. He is damn lucky I do not call the law on him but I do plan on calling him in front of all of our friends, he has been giving all of us fits.
So will I be able to look up some suspicious emails as well?
You'll need to get the email header. This article explains how. https://www.whatismyip.com/how-to-trace-an-e-mail-address/
Then run the header information through our email header analyzer to get the IP address. https://www.whatismyip.com/email-header-analyzer/
You can then lookup the IP address information here: https://www.whatismyip.com/ip-address-lookup/
I encourage you to read all material provided on the pages linked above. You'll learn that tracing emails or IP addresses is not an exact science. Once you find the information you're looking for, I also encourage you to get law enforcement involved. As a popular court tv show host used to say, "never take the law into your own hands".