Ways to share all emails between addresses automatically (send and receive)

Ways to share all emails between addresses automatically (send and receive)

Hey there, so I have a question about Zoho Mail, as I have thus far been able to migrate all the things we are doing from GSuite to Zoho except the mail portion. Currently we use a chrome extension to auto BCC my business manager, and forwarding rules to forward a copy of all received mail to him as well. 

I'd like to incorporate something similar but I noticed there are some sharing functionalities within Zoho I don't quite have a handle on.

Is it possible to automatically share emails with another user in Zoho Mail without using a shared inbox? We both want to retain our individual emails we just want to automatically share these emails with each other. I saw the share button but I don't want to have to click that on all individual emails.

Thoughts?