I have several email accounts and would like to automatically BBC sent emails from one account to another account. When I select Automatically BBC in Mail/Preferences/Composing it will only BCC to the account that is used to compose the email. I want to BCC to another account. I have found some old tips here: https://apple.stackexchange.com/questions/133321/forward-or-bcc-a-copy-of-all-outgoing-mail They might work in Sieraa but I would prefer to not use Terminal (the BCC'd email does not display in the sent mail). "Rules" don't seem to work for the Sent mailbox. Any suggestions?