How do I update SFDC contacts based on Marketo person's email address?

Anonymous
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How do I update SFDC contacts based on Marketo person's email address?

Hi all,

I'm a SFDC admin who is trying my hand at using our Marketo - SF sync to update our contacts.

How do I get Marketo contacts to sync and update existing SFDC contact fields based on the email address as the unique identifier?

Currently the sync is trying to create NEW contacts in SFDC and is running into validation rule errors.

If someone can point me in the right direction that would be great thanks!