Download: Lisp:mail-field.el
Lisp:mail-field.el defines two functions, mail-next-field and mail-previous-field which you can use to easily navigate between mail headers.
Put mail-field.el in your load-path and add the following line to the .emacs file:
(require 'mail-field)
For the MailMode:
(add-hook 'mail-mode-hook '(lambda ()
(define-key mail-mode-map [C-tab] 'mail-next-field)
(define-key mail-mode-map [S-C-tab] 'mail-previous-field)))For MessageMode:
(add-hook 'message-mode-hook '(lambda ()
(define-key message-mode-map [C-tab] 'mail-next-field)
(define-key message-mode-map [S-C-tab] 'mail-previous-field)))