Need Classic ASP developer to help fight form spam

General information for the website: Editing formmail processing script
Description of requirements/features: A client of mine has many, many websites which all use the same formmail.asp file to process their contact forms. The form processor comes from this website: http://brainjar.com/asp/formmail/

It appears the script has not been updated in many years. It has become quite susceptible to spam.

I am looking for someone who know how to code in classic .asp that can modify this formmail script to help prevent some of the spam.

1) Install a honeypot
2) Check the time between page load and form submission and reject submissions that occur too fast for a human to have filled in the form
3) Install a captcha or other verification check

I'm also up for suggestions.
Specific technologies required: .asp
Extra notes: