We’re excited to share that Multi-Geo In-Region Routing reached General Availability in December 2025. This new capability extends the value of Microsoft 365 Multi-Geo Capabilities add-on ("Multi-Geo") by giving admins of Multi-Geo customers with globally distributed users the ability to configure controls over where a tenant’s inbound anonymous and hybrid email enters Exchange Online.
Why In-Region Routing?
By default, all inbound anonymous and hybrid email to a Microsoft 365 tenant with Multi-Geo enters Exchange Online in the tenant’s region first and then is relayed within Microsoft’s secure internal network to the email recipient. For customers with users distributed globally, this model may not fully meet their business needs.
Multi-Geo In-Region Routing was built to help address this challenge.
What does Multi-Geo In-Region Routing offer?
With In-Region Routing, customers can control the geographic location where inbound email enters Exchange Online for:
- Anonymous inbound mail
- Hybrid inbound mail from on premises
Multi-Geo In-Region Routing helps ensure that anonymous inbound email and hybrid inbound email enters Exchange Online in the same geography as the recipient user – provided the tenant is properly configured.
How it works (at a high level)
In-Region Routing allows customers to:
- Associate Accepted Domains with specific geo‑regions
- Align those domains with users located in the same regions
- Ensure inbound and hybrid email for those domains enters Exchange Online in the recipient’s region
A natural extension of Multi‑Geo
In-Region Routing is an included feature in Multi-Geo and builds on existing Multi-Geo Capabilities. When configured properly, inbound email for an In-Region Routing domain will no longer enter Exchange Online in the tenant’s Primary Provisioned Geography region first but instead enter directly in the recipient’s region. It’s another step toward giving customers meaningful, transparent controls over how Microsoft 365 operates in global environments.
Get started
If you’re already using or planning to use Multi-Geo, now is a great time to review your domain and user alignment and then consider whether In-Region Routing can help meet your regulatory or organizational requirements.
Learn more: Configure Multi-Geo In-Region Routing - Microsoft 365 Enterprise | Microsoft Learn
Microsoft 365 Messaging Team
