Variable: mail-self-blind
mail-self-blind is a customizable variable defined in sendmail.el.gz.
Value
nil
Documentation
Non-nil means insert Bcc to self in messages to be sent.
This is done when the message is initialized,
so you can remove or alter the Bcc field to override the default.
If you are using message-mode to compose messages, customize the
variable message-default-mail-headers instead.
Source Code
;; Defined in /usr/src/emacs/lisp/mail/sendmail.el.gz
;;;###autoload
(defcustom mail-self-blind nil
"Non-nil means insert Bcc to self in messages to be sent.
This is done when the message is initialized,
so you can remove or alter the Bcc field to override the default.
If you are using `message-mode' to compose messages, customize the
variable `message-default-mail-headers' instead."
:type 'boolean)