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deliverability-improvement

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The deliverability-improvement tag on WindowsForum.com covers Microsoft's MOERA throttle policy, which caps outbound email from onmicrosoft.com addresses at 100 external recipients per day per tenant. This change aims to improve email deliverability by preventing abuse of the default tenant domain, which was designed for testing and provisioning, not production sending. Discussions focus on the phased rollout starting October 2025, compliance requirements, and strategies to avoid throttling, such as using custom domains or authenticated email services. The tag is relevant for IT administrators managing Microsoft 365 email routing and seeking to maintain reliable outbound delivery.
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    MOERA Throttle: Microsoft Caps Onmicrosoft.com Email at 100 External Recipients/Day

    Microsoft is moving to strictly limit outbound email sent from the shared .onmicrosoft.com tenant namespace — commonly called MOERA (Microsoft Online Email Routing Address) — introducing a hard cap that will throttle messages sent from onmicrosoft.com addresses to 100 external recipients per...
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    • 24hourwindow abuse prevention custom domain deliverability-improvement distribution lists dkim dmarc domain security email deliverability esp exchange online external recipients external-recipient-limit high volume email message center microsoft 365 migration migration checklist moera ndr 550 5.7.236 onmicrosoft outboundemail primarysmtp recipientcount rollout timeline security spf tenant-hygiene upn
    • Replies: 1
    • Forum: Windows News
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