formmail.cgi should already be in your cgi-bin directory. Formmail is a simple to use cgi script that will email to you the contents of a web based form. To use it, simply reference it in your html page like:
<FORM ACTION="http://www.YourDomain.com/cgi-Domain/formmail.cgi" METHOD="POST">

You will need to at least include the following line containing the email address of where you want the form information to be emailed to:
<INPUT TYPE="hidden" NAME="recipient" VALUE="EmailAddress@YourDomain.com">

That's it! Of course, there are lots of other configuration options you can set to customize how the email will look, require certain fields, and redirect the user to a URL after submitting the form. This link contains the various options for customizing formmail.cgi