177: Why doesn't GNUS generate the `Lines:' header?
  
  GNUS was written for B news, which would generate the `Lines:' header.  C
  news doesn't.  There is a comment in C news's `inews' that you can
  uncomment to enable this functionality.  Or you can have GNUS generate the
  header, for example:
  
    ;; idea by jbryans@beach.csulb.edu (Jack Bryans)
    (defun add-lines-header ()
      ;; Count the number of lines in the current posting and insert the
      ;; header line Lines into the message.
      (save-excursion
        (goto-char (point-min))
        (if (search-forward "\n\n") ;; ***** I suspect this is wrong *****
          (let ((lines (count-lines (point) (point-max))))
            (forward-line -1)
            (insert-string "Lines: " lines "\n")))))
  
  Mike Williams <mike-w@cs.aukuni.ac.nz> has written something similar.
  
  Ronald Florence <ron@mlfarm.com> has a patch for GNUS that makes it
  calculate the `Lines:' header for incoming articles when necessary that
  works for sites with local news spools.