How do I learn the identity of <i3cc@hotmail.com and how did this person obtain my email address?

I am receiving unacceptable email and sender is not in my addresses book, yet these emails by-pass my suspect mail file. How/why is this being accomplished? How can I learn the identity of this creep?
How do I learn the identity of %26lt;i3cc@hotmail.com and how did this person obtain my email address?
i would search the e-mail adress i've don eit before i just cannot rember how to