Gmail Add-in: potentially creating duplicates?

[Anonymous]

We use salesforce.com, we just implemented Marketo and we are about to start using this add-in. We are scared about creating duplicate leads or contacts, since it creates a new lead automatically each time marketo doesn't find the email address in the system. Any tips on how to address this potential issue?

[Edward_Masson]

if marketo can't find the unique email address (does not exist in both SFDC and Marketo), it will create a new record which is what you want.

It wont create a duplicate, but will append any extra information gatherered on the form or from the list loaded.

[Anonymous]

And if the record in SFDC and Marketo does not have an email address, it will create a new one, correct?