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ELISP> (progn
   (push "~/xemacs/site-lisp/packages/ngnus-0.10/lisp" load-path)
   (car load-path))
"~/xemacs/site-lisp/packages/ngnus-0.10/lisp"
ELISP> (require 'mail-extr)
mail-extr
ELISP> (locate-library "mail-extr")
"/usr/share/xemacs21/xemacs-packages/lisp/mail-lib/mail-extr.elc"
ELISP> (mail-extract-address-components "Uwe Brauer <oub@mat.ucm.es>" t)
(("Uwe Brauer" "oub@mat.ucm.es"))

ELISP> (nth 0 (mail-extract-address-components "Uwe Brauer <oub@mat.ucm.es>" t))
("Uwe Brauer" "oub@mat.ucm.es")

ELISP> (cadr (nth 0 (mail-extract-address-components "Uwe Brauer <oub@mat.ucm.es>" t)))
"oub@mat.ucm.es"
ELISP> (require 'message)
message
ELISP> (locate-library "message")
"/home/oub/xemacs/site-lisp/packages/ngnus-0.10/lisp/message.elc"
ELISP> (message-bogus-recipient-p "Uwe Brauer <oub@mat.ucm.es>")
nil
ELISP> emacs-version
"21.4 (patch 19) \"Constant Variable\" XEmacs Lucid"
ELISP>