What do you do with e-mail address of customers who unchecked "accepts marketing" on your e-commerce?

Do you even store them on your list, doesn't that take up dead space?

Any advice?

submitted by /u/SwampLordX
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source https://www.reddit.com/r/Emailmarketing/comments/gvkpw6/what_do_you_do_with_email_address_of_customers/