You may want to use ArsDigita Telegraph (
http://tools.arsdigita.c
om/telegraph/). If you want something on your own server,
just use set_variables_after_query and ns_sendmail to do it.
You'll need to know the variable names, but if you're the one
creating the form, it shouldn't be too hard to do. It'd look
something like:
set_variables_after_query
ns_sendmail $your_email $your_email "Form Submission"
"Name: $name
Address: $address
Phone: $phone"
where name, address and phone are the name of the variables
in your form. If you have problems, feel free to email me.