Introduction
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 simplifies onboarding for SMTP clients using OAuth and provides a scalable, secure, and modern approach to managing mailbox access.
This message is associated with Microsoft 365 Roadmap ID 498356.
When this will happen:
- General Availability (Worldwide): We will begin rolling out early November 2025 and expect to complete by late November 2025.
How this affects your organization:
Who is affected:
- Admins managing SMTP AUTH clients using OAuth in Exchange Online.
What will happen:
- Admins can assign the SMTP.SendAsApp role to applications via App RBAC.
- This enables group-based or scoped access to mailboxes.
- Eliminates the need for per-mailbox permission assignments.
- Streamlines onboarding for SMTP clients using OAuth.
- No changes to end-user experience.
What you can do to prepare:
Compliance considerations:No compliance considerations identified, review as appropriate for your organization.