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Exchange Team Blog
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Limiting Onmicrosoft Domain Usage for Sending Emails

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The_Exchange_Team
Platinum Contributor
Aug 20, 2025
MOERA domains for email When a organization creates a new tenant in Microsoft 365, an onmicrosoft.com domain (or similar default domain like onmicrosoft.de) is provided. These MOERA (Microsoft Onli...
Updated Aug 28, 2025
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d_c's avatar
d_c
Copper Contributor
Sep 01, 2025

Will this affect other Microsoft products like Viva Engage that uses an onmicrosoft.com domain to send out email alert notifications for any given Community activity.

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SeanMSFT
Icon for Microsoft rankMicrosoft
Sep 04, 2025

Yes, if Viva Engage or any other product sends on your behalf from your own domain, customers need to ensure that your organization's customer domain is used. There is no throttling for internal emails but there are scenarios such as forwarding where throttling would be triggered for even those.