| Type | Subtype | Description |
| Text | Plain | Unformatted text |
| Richtext | Text including simple formatting commands | |
| Image | Gif | Still picture in GIF format |
| Jpeg | Still picture in JPEG format | |
| Audio | Basic | Audible sound |
| Video | Mpeg | Movie in MPEG format |
| Application | Octet-stream | An uninterepted byte sequence |
| Postscript | A printable document in Postscript | |
| Rfc 822 | A MIME RFC 822 message | |
| Message | Partial | Message has been split for transmission |
| External-body | Message itself must be fetched over the net | |
| Mixed | Independent parts in the specified order | |
| Multipart | Alternative | Same message in different formats |
| Parallel | Parts must be viewed simultaneously | |
| Digest | Each part is a complete RFC 822 message |