Now that you've been migrated to Xplor Transactional Email, you may disable the Transactional Email service within your self-managed Mandrill account. We recommend waiting 14- 30 days from your launch on Xplor Transactional Email so that you still have access to any historic information and can re-send previous emails if needed (i.e. email gift card record in case a client misplaces it).
When you're ready, step-by-step instructions for removing transactional email service can be found on Mailchimp's site, here.
If you have any questions or difficulty with this process, we recommend reaching out to Mailchimp's support team for assistance.