outboundemail

The outboundemail tag on WindowsForum.com covers Microsoft's enforcement of sending limits on the default onmicrosoft.com tenant domain, known as MOERA (Microsoft Online Email Routing Address). Discussions detail a new hard cap throttling outbound email from this domain to 100 external recipients per organization in a 24-hour rolling window, with phased rollout starting October 15, 2025. The tag focuses on the implications for Microsoft 365 tenants that use the shared namespace for testing or early configuration, highlighting the transition away from using onmicrosoft.com addresses for production outbound email and the need for custom domains or alternative sending solutions.