Variable: rmail-display-summary
rmail-display-summary is a customizable variable defined in
rmail.el.gz.
Value
nil
Documentation
If non-nil, Rmail always displays the summary buffer.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/rmail.el.gz
(defcustom rmail-display-summary nil
"If non-nil, Rmail always displays the summary buffer."
:group 'rmail-summary
:type 'boolean)