There are four options available within the Proofpoint End User Digest and Quarantine

The View option allows client to read email with Proofpoint's protection, to determine whether it is spam
The Release option sends the email into the client's Inbox
The Safelist option identifies the sender of the message as a safe sender and no longer quarantines messages from that address
The Not Spam option releases the email into client's Inbox, and sends notification so that subsequent similar messages will not be filtered out as spam.

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