Outbox issue

Victor_Ivanidze Hello Victor, My team (6 members) works on a shared mailbox. Now, this mailbox was created by my client and we use it for our day to day activity. Our work involves dealing with data and documents (confidential nature). Now, my team is responsible for replying to the emails received in shared mailbox. As the emails (to respond) are huge in numbers, we sometime end up sending incorrect emails. For example: sending incorrect attachment, sending to incorrect recipient, sending emails without removing confidential data in e-trail. Now, if any of the above occurs it leads to security and data breach. 

To avoid the above, i set this defer deliver rule (only for emails with attachment to avoid security incident) which is working totally fine, but the emails stuck in the outbox is not visible to all users of that shared mailbox. My idea was to appoint a person who would perform quality check of all the emails (with attachment) stuck in the outbox sent by the team. Unfortunately, as outbox is not syncing this quality check thing is not possible since that person's outbox will not show the emails.

This is the reason why i want outbox to sync and reflect the emails (in outbox) to all the users.

PS: My team is using  Outlook 2016.