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Interesting. How are the differentiating new / existing customer?

You need to upload a list from your CRM there is an integration in Audience list.

Would love to see the efficiency as most of the CRM data would be official email which would be difficult to match to Gmail address

How's the result @Hemant

@Balaji Sundareswaran Looks like this works on for Perf. Max. campaigns! so haven't tried it yet!