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SPAM in spite of CAPTCHA

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The form on this page is getting spammed so I turned on the captcha. It's still getting spammed:

http://www.calculateedu.com/contact-us...

It's a 5.7 site.

What can be done? Are there other captcha options?
kreative
 
ramonleenders replied on at Permalink Reply
ramonleenders
The CAPTHA is a bit outdated, you got reCAPTCHA now. There's an Add-On for it in 5.7:

https://www.concrete5.org/marketplace/addons/recaptcha...

There will be invisible captcha anytime soon too, it's in beta now. So you'll have an even better option after that's out of beta!
kreative replied on at Permalink Reply
kreative
Thanks!
zaneweb replied on at Permalink Reply
zaneweb
What kind of spam? Advertisements, scams, etc?

Also, are you sure it is due to the CAPTCHA not performing correctly? It could just be spammers actually solving the CAPTCHA. What is the volume of spam? If it is a large volume, the CAPTCHA could be not working, whereas with a medium or smaller amount it could be dedicated spammers.

I hope this helps!
kreative replied on at Permalink Reply
kreative
It's mostly gibberish with links embedded throughout. The volume is low - several per day so it's probably manual. I didn't think that was an option but I guess it is and I suppose there's not much I can do about that except take down the form for a while and hope they move on.
Gondwana replied on at Permalink Reply
Gondwana
A radical alternative is to disallow links to be posted. This blocks captcha-solving farms too. Of course, if you need links in posts, this won't work.

An implementation you could adapt is here:
https://www.concrete5.org/marketplace/addons/contact-form-no-links1...
zaneweb replied on at Permalink Reply
zaneweb
However, you do need to be aware that the contact form posted above does not accept CAPTCHA (or reCAPTCHA). And as @ramonleenders said, you should use reCAPTCHA for extra spam verification.
kreative replied on at Permalink Reply
kreative
I'm using recaptcha and so far so good. Thanks for the replies everyone.