Formit Math being bypassed

I have math enabled on all of our Formit forms, and recently I've noticed that somehow the math question is being bypassed. I have the form sending just the variables, and here is an example result:

emp: 45
nospam:blank:
pty: 21
opt:
name: BackPage Ads Posting
email: [email protected]
subject: http://SocialAdsBlaster.com/
math:required: BackPage Ads Posting
text: AD POSTING SERVICE - http://SocialAdsBlaster.com AD POSTING SERVICE - Right Product / Service + Right Presentation + In Front Of The Right People ! BACKPAGE POSTING SERVICE - 24/7/365 - Stop Sitting In Front Of Your Computer All Day - No Brainer! http://SocialAdsBlaster.com BackPage Ads Posting http://SocialAdsBlaster.com/
math: BackPage Ads Posting

I've found this on modx.com. Math questions can be beaten by anything that can be resolved by using the google api by a bot. Especially if there are ways to detect if it is a FormIt form.

Jay, any recommendations for stopping this? Also why is the math field returning "BackPage Ads Posting"

I am going to test this, but I've added a URL detection validator to the subject and message. Basically looking for parts of a URL and preventing submission if it matches anything.

I've found this method very effective at stopping bot spam:

http://www.bitego.com/weblog/2014/05/26/protect-a-formit-web-form-from-spam-without-using-a-captcha.html

Dan, thanks for the reply. We used to use that method, but haven't needed to in a couple years. The URL detection worked, but I might add a confirm email field back to our basic form.