The standard form2mail script doesn't work very well for this.
There are a variety of scripts at www.cgi-resources.com that may work out well for you.
You might want to check out the script I wrote for this. I use it at http://generous.net It automatically detects which page it was called from, so you can use exactly the same code on every page - which makes it extremely convenient for including in SSI files. It also has separate fields for username and domain, since AOL users seem to think that a screen name like "hot2trot" is a complete email address, instead of "email@example.com" I offer the script for $35, installed.