Mu contacts source for helm
.
Put this file on your Emacs-Lisp load path, add following into your ~/.emacs startup file:
(require 'helm-mu-contacts)
(define-key message-mode-map (kbd "C-c C-f c") 'helm-mu-contacts)
When composing a message you can type C-c C-f c
and select the contact using helm
.