We're simplifying how organizations grant applications permission to send email on behalf of mailboxes. Today, customers must manually assign permissions to each individual mailbox using PowerShell, which is time-consuming and inefficient. With this new capability, admins can assign the SMTP.SendAsApp role to an app through App Role-Based Access Control (RBAC), enabling group-based or scoped access to mailboxes. This eliminates the need for per-mailbox configuration and streamlines onboarding for SMTP clients using OAuth. It’s a scalable, secure, and modern approach to managing mailbox access for applications.
GA date: November CY2025
Preview date: October CY2025