For password protected attachments, if Quarantine. User is alerted and allowed to restore the email workflow is defined for the policy, and if the end-user requests to release the email, the administrator is notified about the request.
To review the request:
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Open the security event of the email for which the user requested to release.
Under Security Stack, the password-protected attachments which are not scanned by Anti-Malware will be marked as Insecure attachments found.
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To inspect the password-protected attachments before restoring the email.
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Click Type in passwords to enter the password for the attachment.
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Enter the password for the attachment and click Submit.

The Anti-Malware engine scans the attachment and gives a verdict. Depending on the verdict decide whether to restore the email or not.
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To restore the email and its attachments, click Restore Email.
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To release the original email without inspecting the password-protected attachments, click Restore Email.