Hi fireman and Sprattoo,
Welcome to the forum! That's a great question. While your customer's email addresses are available in your account history, we would only want that information to be used for communication regarding their PayPal order.
The customer would need to provide their consent to receive marketing emails during your checkout process. Many businesses will collect their customer's email address on their website. Then obtain their consent to send them marketing emails before sending the customer to PayPal to complete checkout. You could then maintain a list of emails that have given consent to be emailed your promotions.
I hope this helps! For more information about privacy, see Section 1.3 in the PayPal User Agreement and this section in our Privacy Policy.
- Frank
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