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