nntp

问题 After looking at the NNTP standard, I have figured out how to extract a header from the message, how to fold headers, and how to separate the header label from the header text. What I can't find is an official list of standard NNTP headers. The standard lists Subject, From, Date, Message-id, Reference but not Groups which I know needs to be there. Is there an official list of all the official NNTP headers? For bonus marks, is there a list of commonly-used, unofficial headers? EDIT I found the