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We collect emails from customers, some are entirely new, others are repeat, meaning we get their email address weekly. We've recently implemented a welcome email, which is great, but I was wondering if there is a way to upload the list weekly of totally unique emails. Aside from manually sorting and deleting in excel, we want to keep the opt outs and errors within the welcome group, but don't want to send the same welcome email to the same person more than once.