*   Fix Bcc header not being included with emails from `create_inbound_email_from` test helpers.

    *jduff*

*   Add `ApplicationMailbox.mailbox_for` to expose mailbox routing.

    *James Dabbs*


Please check [6-0-stable](https://github.com/rails/rails/blob/6-0-stable/actionmailbox/CHANGELOG.md) for previous changes.