Understanding and Using your quarantine digest to improve spam detection - Proofpoint
Instructions for Proofpoint – Quarantine Digest Email - automatically @16:00 PM Proofpoint send a daily email in case if you have quarantined emails in your Inbox.
An example Quarantine Digest Email is shown below:

DIGEST AVAILABLE ACTIONS
The generated report contains a detailed list of items currently present in the user email Quarantine. The report allows users to:
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Preview - Allows the user to preview the message that was quarantined.
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Release Email - Allows the user to release a specific email from a sender one time. This release function does not update the Proofpoint Essentials spam learning engine and does not create any rules in relation to the sender.
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Release & Approve - Allows the user to have the desired message released immediately and inform Admin to create a Whitelist(Allow) rule between the sender and recipient so that mail will not be qualified as Spam from this sender in future. It further helps the Proofpoint Essentials engine learn that this sender is not a spammer and update their understanding for the entire company.
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Block - Adds the sender to the blocked sender list to ensure these messages are blocked regardless of content in the future.
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Request New Digest - Requests the latest version of the digest to be delivered to your Inbox.
Contact IT support if you have any questions or issues.