How do we stop these SPAM leads from registering to our campaign?

[Oslec_Arsua]

We got about more than 50k of these since last week.  The Marketo registration form was already been removed from our website. Our IT guy is now working on adding a recaptcha in our Marketo forms. But is there a way from blocking these from coming in? Like a flow or a rule? 

Original source type is Web form fillout. 

[SanfordWhiteman · Accepted solution]

reCAPTCHA will tell whether the lead was created by a human or bot, but it doesn't — can't — stop the form submission itself.

So you can't stop the leads from existing at least for a moment. And though you can delete them immediately on a failed reCAPTCHA verification webhook, a better bet is to promptly quarantine them in a static list and clean that list out with a batch.