Snippets Support > Snippets > HoneyPot
This snippet is designed to 1) fail sending the email if an invisible "honeypot" subject line is filled in (spambots generally fillin every input field), and 2) fail if the captcha is not entered properly.
Normally the Honeypot line is hidden by %comment% so only spambots will see it and fill it in.
It basically reduces the amount of junk in your inbox. Thanks Crisses for hammering out this great Snippet!