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Unfortunately the three Marketo document links are no longer available
Can I add CAPTCHA to a Marketo form?
No, you cannot, but you also should not need to. Marketo has a built in protection mechanism that helps tremendously with reducing the number of spam form fills. Adding a CAPTCHA would negatively impact your legitimate conversion rates.
3. Same as the first link.
If I weren't kinda desperate to solve this issue, I'd laugh 🙂
I posted a recipe for adding a ReCAPTCHA to Marketo forms a couple of months ago -- search for it.
The claim that you can't add CAPTCHA to Marketo forms hasn't been true since webhooks have been available.
Thank you. I wrote that out of frustration/humor, but I'm not completely helpless. Possible solutions include:
1) Creating a "honeypot" or hidden field that filters anyone who fills it out to a Smart List for deletion Stop 99% of Your Spam Leads with Marketo | Fab Capodicasa | LinkedIn
2) Adding CAPTCHA - MktoForms2 :: reCAPTCHA (your link from another article)
4) Adding a script that restricts certain parameters ex. Email Domain http://developers.marketo.com/blog/restrict-free-email-domains-on-form-fill-out/
While all of these are valid solutions I still find myself a bit lost here. My personal solution for the time being is to take the Smart Lists that I've already created (This article is helpful for setting those up - http://developers.marketo.com/blog/how-to-clean-your-marketo-database/ ) to identify the spam leads using several filters and simply add a Flow step to delete them as they're identified.