tenant-hygiene

Tenant hygiene refers to the practices and policies that keep a Microsoft 365 tenant secure, compliant, and well-managed. A key example is Microsoft's MOERA throttle, which caps outbound email from the shared onmicrosoft.com domain at 100 external recipients per day per organization. This change, rolling out in phases from October 2025, targets trial tenants first and aims to prevent abuse of the default domain, which is intended for testing and provisioning, not production sending. Proper tenant hygiene involves monitoring such limits, managing default domains, and ensuring that tenant configurations align with Microsoft's evolving security and compliance standards.