Hello @StevenR503,
You can delete the list after you send the email campaign. However, you will lose your contacts' engagement histories if you do. The engagement history is ultimately a report of what the contact did in regards to the email (opened, clicked, bounced, unsubscribed, etc.). Since this is valuable information, I wouldn't recommend deleting contacts after you email them. Is there a reason that you want to delete the contacts? If so, I may be able to come up with a workaround to suite your needs.
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