Email Receipt and sign up for newsletter

New Member
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Hello - I just came back from an event where I sold through my POS. During checkout I ask people if they'd like their receipt emailed to them - AND - that it would also sign them up for our newsletter. Everyone said yes - or if they didn't they just didn't even want their receipt. But now when I go into my Shopify back-end - those emails haven't been added to my customer email lists... How can I add them? Do I have to each one separately? There were hundreds of sales.... so that would take forever!  Help is there a better way?