Mamp Pro mail - where does it go?

Question

MAMP

I'm trying to switch from an open server to a mump-pro, I
sort of figured out the basic settings,
only with the mail I couldn't
find which folder the test letters .txt sent from local forms are sent to?
how to change it / how to configure so that these letters are sent to [email protected]
I did not find working manuals in an understandable language.