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I don't think there is a way that Marketo can natively do that. However, there are some partners that might be able to help, like Email Address Verification Service – Marketo LaunchPoint ?
Or you could set up a smart campaign that merges leads if a certain number of fields are duplicates - like first name, last name, company name and job title? Something that definitely shows the leads are the same person.
Hope this helps
Thanks, July and Sanford! Is it possible to create a smart campaign that merges duplicate record. I am not sure that such flow step exists.