| Retain RFC-822 header+body format |
| Add new header fields |
| Allow for multipart multimedia bodies |
| Include media type and encoding information in new header fields such as: Content-Type, Content-Description, Content-Transfer-Encoding, Content-ID |
| Retain 7-bit ASCII for all valid encoding schemes |
| Implement multi-component bodies via a special 'magic type' Content-Type: multipart |
| Provide natural support required for large multimedia message files such as remote references (similar to hyperlinks but NOT the URL model) and file fragmentation by further specification of the 'multipart' type. |