phranque - 10:10 pm on Jul 18, 2013 (gmt 0)
welcome to WebmasterWorld, KTFandC!
have you considered implementing some form of CAPTCHA?
depending on your situation it could be as simple as having a form field that asks "what is 3 plus 2?" or "what color is the sky?"
the techniques can get increasingly sophisticated from there as required.
however there are many that hate CAPTCHA and it can have accessibility issues.
CAPTCHA Rant - New To Web Development forum:
you might also consider alternatives to CAPTCHA.
this might give you some ideas.
Spam filtering: now with 100% less CAPTCHA - Webmaster General forum: