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defender-office-365/anti-malware-protection-about.md

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description: Admins can learn about anti-malware protection and anti-malware policies that protect against viruses, spyware, and ransomware in Exchange Online Protection (EOP).
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ms.custom: seo-marvel-apr2020
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ms.service: defender-office-365
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ms.date: 06/11/2024
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ms.date: 05/13/2025
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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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### Priority of anti-malware policies
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If they're [turned on](preset-security-policies.md#use-the-microsoft-defender-portal-to-assign-standard-and-strict-preset-security-policies-to-users), the Standard and Strict preset security policies are applied before any custom anti-malware policies or the default policy (Strict is always first). If you create multiple custom anti-malware policies, you can specify the order that they're applied. Policy processing stops after the first policy is applied (the highest priority policy for that recipient).
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If Preset security policies are [turned on](preset-security-policies.md#use-the-microsoft-defender-portal-to-assign-standard-and-strict-preset-security-policies-to-users), the Standard and Strict preset security policies are applied before any custom anti-malware policies or the default policy (Strict is always first). If you create multiple custom anti-malware policies, you can specify the order that they're applied. Policy processing stops after the first policy is applied (the highest priority policy for that recipient).
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In other words, when a recipient is defined in multiple anti-malware policies, the policies are applied in the following order:
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1. The Strict preset security policy.
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2. The Standard preset security policy.
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3. Custom policies based on the priority of the policy (a lower number indicates a higher priority).
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4. The default anti-malware policy.
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For more information about the order of precedence and how multiple policies are evaluated, see [Order and precedence of email protection](how-policies-and-protections-are-combined.md) and [Order of precedence for preset security policies and other policies](preset-security-policies.md#order-of-precedence-for-preset-security-policies-and-other-policies).
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