(define-key map (kbd "<backtab>") 'notmuch-show-previous-button)
(define-key map (kbd "TAB") 'notmuch-show-next-button)
(define-key map "s" 'notmuch-search)
(define-key map (kbd "<backtab>") 'notmuch-show-previous-button)
(define-key map (kbd "TAB") 'notmuch-show-next-button)
(define-key map "s" 'notmuch-search)