For a given email address, update the email type subscription status, or permanently unsubscribe an email address from all email.
The subscription status is tied to the email address, and not a specific contact record. Because of this, it is possible to update the status for an email address even if there is not currently a contact with that email address. If the status is updated for an email address not currently associated with a contact, and a contact is later created, the email eligibility of the updated email address will apply to the new contact. The same would be true if there was an existing contact, and the contact was deleted, and a new contact with the same email address was created.
Note: It is only possible to opt email addresses OUT of all emails or a specific email subscription type, and there is NO UNDO for this operation.