Who is the person behind the E-mail [e-mail]?

Answer 1

How can i know ?

Answer 2

there are two ways to do this
1) requires a search warrant, and if you can get one of those then you'd know how do do the rest of those steps.

2) e-mail that address and ask the person.

a 3rd way that may or may not work is to go to http://profiles.yahoo.com/maladonansi
if they know about the yahoo profiles and decided to make their name public it'll be there.