Has anyone experienced a web lead(Form fill with all fields marked as mandatory) coming into Marketo without any data/just one field (first name)populated. what could be the reason for such leads.
"Required" fields are only required if the person has JavaScript enabled and isn't malicious.
If the person is browsing with JS off (unlikely, but possible) or forges a form post to get around your validation, they can pass any data they want (this is the case with all web forms, not just Marketo's).
Are you using Marketo landing page on website or only the form on third party web page. I have number of form which are used on third party website but I never faced any such scenario. If possible, can you clone the form/page and provide the link so we can check and help you.
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