Security Labels
15.36. What Is a Security Label?
A security label is a piece of information that is inserted into the header of an e-mail. It is essentially a security tag that allows an e–mail to be controlled by the security policies of the organization that the e-mail administrator has defined. Security labels are part of the S/MIME v3 security protocol; the movement of an e-mail with a security label in its header can be governed by the S/MIME v3 security policies that the administrator has set.
For example, the administrator might have set a policy specifying that all e-mails with a security label such as Internal Use Only do not get delivered to any computer or e-mail address outside of those defined as internal to the organization.
15.37. ...
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