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defender-office-365/tenant-allow-block-list-email-spoof-configure.md

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@@ -15,7 +15,7 @@ ms.collection:
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- tier1
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description: Admins can learn how to allow or block email and spoofed sender entries in the Tenant Allow/Block List.
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ms.service: defender-office-365
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ms.date: 07/18/2024
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ms.date: 11/27/2024
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appliesto:
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- ✅ <a href="https://learn.microsoft.com/defender-office-365/eop-about" target="_blank">Exchange Online Protection</a>
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- ✅ <a href="https://learn.microsoft.com/defender-office-365/mdo-about#defender-for-office-365-plan-1-vs-plan-2-cheat-sheet" target="_blank">Microsoft Defender for Office 365 Plan 1 and Plan 2</a>
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Email from these blocked senders is marked as *high confidence phishing* and quarantined.
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> [!NOTE]
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> Currently, subdomains of the specified domain aren't blocked. For example, if you create a block entry for email from contoso.com, mail from marketing.contoso.com isn't also blocked. You need to create a separate block entry for marketing.contoso.com.
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> Currently, if the block entry doesn't use the syntax \*.TLD, subdomains of the specified domain aren't blocked. For example, if you create a block entry for contoso.com, mail from marketing.contoso.com isn't also blocked. You need to create a separate block entry for marketing.contoso.com or use the \*.TLD syntax, where TLD can be any top-level domain, internal domain, or email address domain.
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>
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> Users in the organization also can't *send* email to these blocked domains and addresses. The message is returned in the following non-delivery report (also known as an NDR or bounce message): `550 5.7.703 Your message can't be delivered because messages to XXX, YYY are blocked by your organization using Tenant Allow Block List.` The entire message is blocked for all internal and external recipients of the message, even if only one recipient email address or domain is defined in a block entry.
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