Admin Quarantine
Admin Quarantine allows you to automatically prevent incoming messages from reaching a recipient’s inbox based on the disposition assigned by Email Security.
The messages sent to Admin Quarantine are determined by your domain settings.
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Log in to the Email Security dashboard ↗.
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Go to Settings (the gear icon).
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Select Email Configuration > Domains.
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Select the three dots on the domain that you want to configure admin quarantine for, and choose Edit.
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In Quarantine Policy choose the dispositions you want to enable quarantine for that domain.
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Select Update Domain.
 
You can view and potentially release emails that were sent to Admin Quarantine:
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Log in to the Email Security dashboard ↗.
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Go to Email > Admin Quarantine.

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Review emails as needed.
 
From Admin Quarantine, you can also release quarantined emails by selecting one or more messages:
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Log in to the Email Security dashboard ↗.
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Go to Email > Admin Quarantine.
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Find the email you want to release.
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Select … > Release.

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Select Release to confirm that you want to release the selected email.
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(Optional) You can also release multiple messages, by selecting the box next to each message you want to release.