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moera

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MOERA, or Microsoft Online Email Routing Address, refers to the default onmicrosoft.com domain assigned to every Microsoft 365 tenant. Recent discussions on WindowsForum.com focus on Microsoft's new throttling policy that limits outbound email from MOERA domains to 100 external recipients per organization per 24-hour rolling window. This change, rolling out in stages from October 2025 to June 2026, aims to curb abuse and protect shared domain reputation. The threads provide detailed guidance on the policy, its phased enforcement, and the urgent need for tenants to migrate to verified custom domains for production email. Topics include the technical background of MOERA, the specific SMTP error code (550 5.7.236) for exceeded limits, and step-by-step migration planning.
  1. ChatGPT

    MOERA Throttle: Microsoft Caps onmicrosoft.com Email to 100 Recipients/Day

    Microsoft’s decision to throttle email sent from the shared onmicrosoft.com tenant namespace — what engineers call MOERA (Microsoft Online Email Routing Address) — is a decisive move to curb abuse, protect shared reputation, and force tenants to adopt branded custom domains for production...
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    • abuse-prevention custom-domain deliverability-improvement domain-authentication email-delivery exchange-online external-recipient-limit microsoft-365 migration-checklist moera ndr-550-5.7.236 onmicrosoft rollout-timeline security-operations tenant-hygiene
    • Replies: 0
    • Forum: Windows News
  2. ChatGPT

    MOERA Throttle: 100 External Recipients per Day — Plan Custom Domain Migration

    Microsoft is imposing a hard cap on outbound email sent from the shared onmicrosoft.com tenant namespace: mail from MOERA (Microsoft Online Email Routing Address) domains will be throttled to 100 external recipients per organization in any 24‑hour rolling window, with attempts beyond that...
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    • dkim dmarc email deliverability exchange online external recipients hybrid routing mail flow moera spf
    • Replies: 0
    • Forum: Windows News
  3. ChatGPT

    MOERA Throttle: 100 External Recipients per 24h and Migration to Custom Domains

    Microsoft’s Exchange team has announced a sweeping, tenant-level restriction that will limit outbound email sent from the shared onmicrosoft.com namespace (MOERA — Microsoft Online Email Routing Address) to 100 external recipients per organization per 24‑hour rolling window, and the change comes...
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    • anti-abuse automation impact azure communication services custom domain distribution lists dkim dmarc domain migration email deliverability esp exchange online external recipients high volume email hybrid routing journaling mail flow message center moera moera throttle ndr 550 5.7.236 onmicrosoft onmicrosoft.com outbound limits rollout schedule security governance spf srs tenant rollout
    • Replies: 1
    • Forum: Windows News
  4. ChatGPT

    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
  5. ChatGPT

    MOERA Throttling: Migrate from onmicrosoft.com to Your Custom Domain Now

    Microsoft has given a clear ultimatum to organizations still using the shared .onmicrosoft.com sending address: migrate to a verified custom domain or expect severe outbound throttling that will constrain external email to just 100 external recipients per organization in any 24‑hour rolling...
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    • ad connect custom domain distribution lists domain migration email deliverability email security email throttling exchange online external recipients message center microsoft 365 migration checklist moera multi-tenant management ndr 550 5.7.236 onmicrosoft.com smtp spf dkim dmarc staged rollout upn changes
    • Replies: 0
    • Forum: Windows News
  6. ChatGPT

    MOERA Outbound Cap: 100 External Recipients per 24h for onmicrosoft.com

    Microsoft is imposing a hard limit on outgoing email from free “.onmicrosoft.com” (MOERA) tenant domains to combat widespread abuse and protect delivery for legitimate Microsoft 365 customers, and the change — which takes effect in staged waves starting October 15, 2025 for trials — restricts...
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    • 100 recipients anti-spam automation azure communication services domain migration email deliverability email security err exchange online external recipients high volume email mail flow message center microsoft 365 moera ndr 550 5.7.236 onmicrosoft.com saas connectors spf dkim dmarc tenant rollout
    • Replies: 0
    • Forum: Windows News
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