(with-eval-after-load 'notmuch
  (defun my-notmuch-search-list-emacs-help ()
    "Notmuch saved search 'List: Emacs Help'."
    '(and (tag unread)
          (or (to "help-gnu-emacs@gnu.org")
              (to "gnu-emacs-help@gnu.org")
              (list "help-gnu-emacs.gnu.org")))))