A question, how can I see the email of the person who sent me money?

[nichooooooooooo]

I know I put the wrong category but I didn't know which one to put for this thing.

A question, how can I see the email of the person who sent me money? I could see it before, then he changed his email (he put another one, I saw it for a little while) and now I can't see it anymore