How can I add bcc: field to all outgoing emails?
I need to "hide" the recipients of all my emails by law. However, sometimes when I pull up a new message by "replying" to an earlier message sent by myself, the message header contains ONLY the "cc:" field, NOT the "bcc:" field (which would otherwise be automatically populated by my own email address. How can I force mail to include the "bcc:" field in EVERY message I create, no matter whether as reply (even to myself) or forward or new edit?
MacBook Pro with Retina display, macOS High Sierra (10.13.4), Magic Mouse