Contains classes for Mime email headers.
|MessageHeader|| Class that holds all headers for a message
Headers which are unknown the the parser will be held in the UnknownHeaders collection.
This class cannot be instantiated from outside the library.
|Received|| Class that hold information about one "Received:" header line.
Visit these RFCs for more information:
RFC 5321 section 4.4
RFC 4021 section 3.6.7
RFC 2822 section 3.6.7
RFC 2821 section 4.4
|RfcMailAddress|| This class is used for RFC compliant email addresses.
The class cannot be instantiated from outside the library.
|ContentTransferEncoding||Enum that describes the ContentTransferEncoding header field|