email shoutbox on frontpage

hello!

i want visitors to be able to send an email using just a single box on the frontpage (index.php). They shall not have to enter email-adress or something. Just type in some words and go. Maybe it could be of any sense to combine this box with a little bot or not question (please type: “ola” or so) using a second field but that is at first not important.

thank you for your help!