How to Configure a Mail Flow Rule in Exchange Online
Step-by-step guide to creating Exchange Online mail flow (transport) rules — conditions, actions, exceptions, common patterns, and PowerShell.
Email — Microsoft 365 admin guides
Guides for Exchange Online administration in Microsoft 365.
How to Create a Shared Mailbox in Exchange Online
Step-by-step guide to creating a shared mailbox in Microsoft 365 — from the admin center, the Exchange admin center, or PowerShell — plus permissions and licensing rules.