Recipients are not listed for quarantined attachments that are blocked in real-time Symptoms
Recipients are not listed for quarantined attachments that are blocked in real-time.
Diagnosis
If malicious or disallowed attachments are blocked during real-time scanning in the Exchange store, they are listed in the Quarantine Query without the name of the corresponding recipient mailbox where they have been blocked.
Solution
The information about the mailbox, which contains the malicious or disallowed attachment, can be found in the product alerts.