Hi @GalenA03 ,
I completely understand. Deleting and re-adding the contacts will not alter the data, such as the engagement history of the contact, so you should be okay to purge the list as long as you are not completely unsubscribing the still-active contacts.
Another option is to get a list of the people who have left the company, and upload them as unsubscribed. You should be aware, however, that you will not be able to add them back in yourself if they are unsubscribed. The contact would need to re-subscribe manually if they ever returned to the company.
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