#+Property: EMAIL foo@bar.org

* Contact Name
   :PROPERTIES:
   :EMAIL+:   bar@baz.org
   :END:

#+begin_src emacs-lisp
  (org-entry-get (point) "email" 'inherit)
#+end_src

#+results:
: foo@bar.org bar@baz.org

* Contact Name
   :PROPERTIES:
   :FOO:    1
   :FOO+:   2
   :END:

#+begin_src emacs-lisp
  (org-entry-get (point) "FOO" 'inherit)
#+end_src

#+results:
: 1