Thank you for reaching out to Constant Contact API Developer Support.
A contact is never truly deleted from within a Constant Contact account, it's simply removed from all lists and no longer visible in the account.
The reason we do this is to maintain data such as accurate reporting, and unsubscribe status behind the scenes. This is also why you cannot POST a new contact with the same email address as a removed/deleted contact; you would need to update the existing "deleted" contact instead.
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