Get info from a human spammer

Hi all,

got a form on my site and someone have fun sending me stupid email. I was wondering, except IP, which useful information can I get from this person?

Thank

Except from what he’s willing to put in his messages? Nothing, I think.

Better to just stop it rather than trying to find out more information about him?

Maybe make a minimum time between posts, say 30 seconds. I doubt anyone out there has the energy to wait 30 seconds between between emails to spam.