Send Marketing Confirmation Email

Shopify Partner
23 0 6

I´m building a headless shop with API´s and on the start page of this shop there will be a "Subscribe to Newsletter" - Field where the customer can input its email. The customer should get an confirmation email afterwards. Is it possible without creating a new customer? I know its possible using the createCustomer endpoint. But then the customer cannot register afterwards with the same email. 

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