The following icons are from GNOME 2.6:

    attach.xpm (stock_attach)
    compose.xpm (stock_mail-compose)
    connect.xpm (stock_connect)
    contact.xpm (stock_contact)
    copy.xpm (stock_mail-copy)
    delete.xpm (stock_delete)
    describe.xpm (stock_properties)
    disconnect.xpm (stock_disconnect)
    exit.xpm (stock_exit)
    forward.xpm (stock_mail-forward)
    inbox.xpm (stock_inbox)
    lock-broken.xpm (stock_lock_broken)
    lock-ok.xpm (stock_lock_ok)
    lock.xpm (stock_lock)
    move.xpm (stock_mail-move)
    next-page.xpm (stock_next-page)
    not-spam.xpm (stock_not-spam)
    outbox.xpm (stock_outbox)
    refresh.xpm (stock_refresh)
    reply-all.xpm (stock_mail-reply-to-all)
    reply.xpm (stock_mail-reply)
    save-draft.xpm (stock_mail-handling)
    send.xpm (stock_mail-send)
    sort-ascending.xpm (stock_sort-ascending)
    sort-column-ascending.xpm (stock_sort-column-ascending)
    sort-criteria.xpm (stock_sort-criteria)
    sort-descending.xpm (stock_sort-descending)
    sort-row-ascending.xpm (stock_sort-row-ascending)
    spam.xpm (stock_spam)
    toggle-subscription.xpm (stock_task-recurring)


The following icons were contributed by Adam Sjøgren <asjo@koldfront.dk>:

    preview.xpm (combining stock_mail and stock_zoom)
    save.xpm    (combining stock_mail, stock_save and stock_convert) 


The GNOME's stock_*.png files were converted to XPM using the following GIMP
script:

;; -*- scheme -*-
;; Put this file in ~/.gimp-*/scripts/
;; gimp -i -b '(rs-save-as-xpm "foo.png" "foo.xpm" 127)'  '(gimp-quit 0)'
(define (rs-save-as-xpm filename filename2 threshold)
  (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE filename filename)))
	 (drawable (car (gimp-image-get-active-layer image))))
    (file-xpm-save RUN-NONINTERACTIVE image drawable
		   filename2 filename2 threshold)
    (gimp-image-delete image)))
;; end
