Variable: mh-thread-id-table
mh-thread-id-table is a buffer-local variable defined in
mh-thread.el.gz.
Documentation
Thread ID table maps from message identifiers to message containers.
Source Code
;; Defined in /usr/src/emacs/lisp/mh-e/mh-thread.el.gz
(defvar-local mh-thread-id-table nil
"Thread ID table maps from message identifiers to message containers.")