Per GDPR guidelines, when a subscriber is deleted from an account, all related activities from the contact record will be removed and the contact email address will be deleted from the database.
If you have an integration bringing contacts into Delivra, what happens if an email address gets deleted (per GDPR) but the contact still exists in an outside CRM or data source? Ex: Netsuite, Salesforce, etc.
The answer is that if the contact did not unsubscribe in Delivra first, it will be re-imported into Delivra.
But, if the contact did unsubscribe in Delivra before the deletion occurred, that email address can never be added back to Delivra. This is the desired behavior to remain compliant with GDPR.
It is best practice to unsubscribe the contact before running the delete action.