| Attachment | Class Attachment. |
| BodyPart | Class BodyPart. |
| BodyPartList | Class BodyPartList. |
| ContentDisposition | Class ContentDisposition. |
| ContentType | Class ContentType. |
| Header | Class Header. |
| HeaderList | Class HeaderList. |
| Mailbox | Represents a mailbox. |
| Message | Class Message. |
| MessageFormatException | The exception that is thrown when load or parse message with wrong format. |
| Parameter | Class Parameter. |
| ParameterList | Class ParameterList. |
| ContentDispositionType | Summary description for ContentDispositionType. |
| ContentTransferEncoding | Specifies the Content-Transfer-Encoding header information for an e-mail message attachment. |
| HeaderEncoding | Contains types of header encoding. |
| StandardHeader | Contains the standard message headers defined in RFC 2822. |