(add-hook 'nntp-server-opened-hook
          (lambda ()
            (cond ((string-match "relay" nntp-address)
                   (nntp-send-nosy-authinfo-from-file))
                  (t
                    ))))
 
(defun nntp-send-nosy-authinfo-from-file ()
  "Send the AUTHINFO to the nntp server, including username and password
  This function is supposed to be called from `nntp-server-opened-hook'."
  (when (file-exists-p "~/.nntp-authinfo")
    (nnheader-temp-write nil
      (insert-file-contents "~/.nntp-authinfo")
      (goto-char (point-min))
      (nntp-send-command
       "^.*\r?\n" "AUTHINFO USER"
       (buffer-substring (point) (progn (end-of-line) (point))))
      (goto-line 2)
      (nntp-send-command 
       "^.*\r?\n" "AUTHINFO PASS" 
       (buffer-substring (point) (progn (end-of-line) (point)))))))