Purging Unsubscribes from the NS customer list

Hi,

We have been using Mailchimp for our marketing emails for the last few months since my company made the switch over to NS, however we are now coming under pressure to make use of the netsuite email system as it has (unbeknown to me) already been paid for.

So, my question is, how can I purge the unsubscribes from Mailchimp from our NS customer database? We really need to get the unsubscribes that mailchimp has logged out of the NS database, or marked as "hard opt out" in NS so as to ensure we don't send to anyone who has unsubscribed and trigger abuse complaints. We can export a list of unsubscribes as CSV from Mailchimp, I'm just really hoping we won't have to do this manually!