| Class | Description |
|---|---|
| AddressListField | |
| ContentTransferEncodingField | Represents a Content-Transfer-Encoding field. |
| ContentTypeField | Represents a Content-Type field. |
| DateTimeField | |
| MailboxField | |
| MailboxListField | |
| MimeField | The base class of all field classes. |
| UnstructuredField | Simple unstructured field such as Subject. |