RFC 1873 Access Type Content-ID December 1995 2.2 Example Usage The following example shows a message that consists of two identical images. MIME-Version: 1.0 Content-Type: Multipart/Mixed; boundary=tiger-lily --tiger-lily Content-Type: image/jpeg Content-ID: [email protected]> AAAcdb... --tiger-lily Content-type: Message/External-Body; access-type=content-id Content-ID: [email protected]> Content-Description: This body part is duplicated by reference --tiger-lily-- The equivalent MIME entity for the second body part is: --tiger-lily Content-Type: image/jpeg Content-ID: [email protected]> Content-Description: This body part is duplicated by reference AAAcdb... --tiger-lily 3. Security Considerations The content-id access-type does not impact the security of messages or systems. The referenced MIME entity may have security implications. Levinson & Clark Experimental