Email is a TERRIBLE communication and collaboration medium!
We have been email-less internally for a number of years. So ALL internal communication happens either on our Trello boards, in Workplace or in comments on a shared document.
Benefit? This has ensured that there are no knowledge silos or critical information that is locked up in someone’s email inbox. Also all conversations are threaded contextualizing everything at a glance.
When we are working with a client we invite them into an external group where all the communication happens, again ensuring no silos and no email.