Unsubscribes – How are these handled with external systems like Retail Express?

If recieve news is off or they don't have an email address they will never go across to MailChimp
If a customer turns off recieve news in Retail Express this only disconnects the record from being updated. It does NOT effect the Mailchimp record at all.

With Mailchimp once unsubscribed they are unable to be re-subscribed regardless of the settings in Retail Express.