I'm sharing mailboxes for users, and they can send emails using persona.

Problem is: If user sending email by persona, email is going to Sent in personal mailbox, but I need copy in shared mailbox.
I would like to BCC email to persona mailbox (by From: - for example, because in Return-Path: user personal email)

How can I do this? sender_bcc_maps not working...

Thanks for your help,