How can that work though??? Its just a page with a line saying:
This is FormMail-clone, a clone of FormMail.cgi. It is a clean room version for legal purposes (a less restrictive liscense), but should behave the exact same way as Matt Wright's Original, but contain none of his code.
Perhaps it is empty if you just http to it directly, but you probably need an HTML form front end, and formmail.pl probably takes some arguments, as the name applies it is an e-mail sending CGI so there has to be more than just 3 lines of text. Open it in shell and take a look.