Real-time scan can skip scanning email messages at the store level when the message has been scanned by ScanMail at the Hub Transport Level. This feature is available for ScanMail with Exchange Server 2010.

Once ScanMail scans a message on an Edge or Hub Transport server, ScanMail adds scan information to the message. When the message reaches the Mailbox, ScanMail evaluates the scan information to prevent redundant use of resources. ScanMail only scans the message if the message was scanned with an older scan engine or pattern file or if ScanMail has not previously scanned the message.