How to import unsubscribed contacts in order to avoid them receiving emails

Hi There,

I am migrating from mailchimp to mailpoet. I want to make sure that the current list of unsubscribed contacts can be imported so that an accidentially import of unsubscribed contacts will be avoided.

This could happen when importing new customers from the shop automatically.
Among these there might be some that unsubscribed before. So they should already be on the unsubscribed list in mailpoet to prevent that they are added again and an email is sent to them again. This might lead to legal consequences.

Any hint how I can ensure the blocking of readded unsubscrid contacts?

Thanks!