Recently we started receiving duplicate leads in marketo. Every details is same but we have 2-3 leads with same email address and other details. How we can prevent this happening?
How depends on why.
If you have malfunctioning custom JS on a webpage, that can cause multiple submissions in a row.
If someone is maliciously attacking your forms endpoint (not actually viewing the webpage but automatically posting forms) that's another matter that can be combated by adding reCAPTCHA.
What are the other characteristics of the leads? Do you believe them all to be false leads?
Well, I'd assume your JS has a bug. You have to hunt that down.
Thanks Sanford. I am working with my developer to resolve the issue.