RFC 4707, "Netnews Administration System (NAS)", October 2006Source of RFC: INDEPENDENT
Errata ID: 5820
Publication Format(s) : TEXT
Reported By: Julien Élie
Date Reported: 2019-08-18
Section 188.8.131.52 says:
quit-answer = "201" [answertext] CRLF
It should say:
quit-answer = "201" [answertext] CRLF [1*text CRLF] "." CRLF
The QUIT command is the only one whose answer does not follow the general ABNF description of answers requiring them to end with a ("." CRLF) line.
I suggest either fixing quit-answer to the above corrected text, or modifying Section 6.1.1 to take into account a special case for QUIT.