# Using emacsclient with exmh is straight-forward.
# Basically it boils down to loading "server.el" in an emacs
# and then setting your exmh editor command to be
    exmh-async emacsclient

# As usual, however, you can get arbitrarily more fancy.
# The remainder of this file contains some more customized
# elisp code from one exmh user.  I am not
# an emacs user (viva mxedit!) so you'll have to contact
# Tom directly if you have questions.  Brent Welch

Here is an my version of mh-letter-mode-hook.el.

I also tossed in a function to make "C-c C-y" (insert replied-to message)
work correctly.  This is a bit crude; it works fine if you use supercite.el
to format the inserted text (as I do) but is pretty dumb if you don't.

You need to add
	(load "server.el")
	(server-start)
to your .emacs file, and either include this in .emacs or load it from there:

---------- cut here ------------

;;
;; mh-letter-mode-hook.el
;;
;; A server-visit-hook that lets mh-letter-mode be invoked when
;; an mh draft is sent to emacs for editing by an emacs client.
;;
;; If the filename to be edited looks like an MH draft file,
;; then we switch into mh-letter mode.  But "\C-c\C-c" is redefined
;; so that 'server-edit is invoked to exit, instead of mh-send-letter.
;; Also, "\C-c\C-y" is redefined to fetch the replied-to message properly.
;;
;; Tom Lane tgl@sss.pgh.pa.us 1/25/94.
;; Based on an idea by Mario Silva msilva@cs.Berkeley.edu.

;; customize server-temp-file-regexp
(setq server-temp-file-regexp "^/tmp/Re\\|/Mail/drafts/")

;; add mh-letter-mode to the autoload list.
(autoload 'mh-letter-mode "mh-e" "mh mail letter mode (not loaded)")

;; add a server-visit-hook that tests for editing a draft file.

(add-hook 'server-visit-hook 'exmh-visit-draft)

(defun exmh-visit-draft ()
  "Test to see if we are told to edit an MH draft file.
If so, switch to mh-letter mode, with a few changes for server mode."
  (cond ((string-match "/Mail/drafts/" buffer-file-name)
	 (mh-letter-mode)
	 (local-set-key "\C-c\C-c" 'server-edit)
	 (local-set-key "\C-c\C-y" 'exmh-mail-yank-original))))

(defun exmh-mail-yank-original (&optional arg)
  "Insert the message being replied to, if any.
Puts point before the text and mark after.
Just \\[universal-argument] as argument means insert literally, no citing."
  (interactive "P")
  (let ((filename (expand-file-name "~/@")))
    (if (file-readable-p filename)
	(let ((filelen (car (cdr (insert-file-contents filename)))))
	  (push-mark (+ (point) filelen) t)
	  (if (consp arg)
	      nil
	    (cond ((and (boundp 'mail-citation-hook) mail-citation-hook)
		   (run-hooks 'mail-citation-hook))
		  ((and (boundp 'mh-yank-hooks) mh-yank-hooks)
		   (let ((mh-ins-string "> "))
			 (run-hooks 'mh-yank-hooks)))))
	  (if (not (eolp)) (insert ?\n))))))

---------- cut here ------------

I've tested this with Emacs 19.22 (in which server.el, mh-e.el, and
supercite.el are all standard files).  Dunno if it will work with
earlier versions.

		regards, tom lane