I have 19000 subscribers. I need to add only 8000, in the beginning, to warm up the Constant Contact panel. I have a Shopify store so the contacts would be synced to it. I want to add 11000 contacts later and prevent them to get synced at the same time (until I add them later). If I unsubscribe them, I won't be able to add them later and I don't want to use sign-up form since the contacts are genuine subscribers. I have used Omnisend and it had the feature to add "Non subscribed" contacts which could later be made "Active". Kindly provide me help in this regard.
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