manual

Background scanning means scanning all folders with a low priority. When an object
that has been checked by the background scanning is requested, it will not be
scanned again unless a virus definition update has been made. Therefore, enabling
this scan method optimizes the overall scanning process.
To perform background scanning of the messages and attachments, the Information
Store will use one thread per database, running at low priority. Once the background
scanning is completed, the thread is terminated. This thread is not part of the global
virus-scanning thread pool used for on-access scanning.
● Enable proactive scanning - select this option if you want proactive scanning to
be enabled.
Proactive scanning means that when a message is submitted to the information
store, either via a client or a transport agent, it is placed in the global scanning queue
with a low priority. If and when threads are available in the thread pool and no high
priority item remains to be scanned, each item with the low priority is submitted for
scanning. Therefore, enabling this scan method optimizes the overall scanning
process.
If an item is on the low priority list and a client attempts to access the message, the
item will be marked as high priority. Also, it will be removed from the low priority list
and another low priority item will take its place.
Note
We recommend you to keep this setting enabled as it prevents the overloading of
the scanning engine.
● Enable transport scanning - select this option if you want transport scanning to
be enabled.
Note
Transport scanning is available only on MS Exchange Server 2003!
Transport scanning means that messages are scanned at the transport level. This
prevents infected messages from entering the Exchange mailboxes.
The messages entering the Exchange store are intercepted by the VS API interface
and scanned by BitDefender. After being scanned, the messages are submitted
again to the transport engine which will deliver them to their destination. Any
message scanned at the gateway will be rescanned on the back-end server.
Antivirus
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BitDefender Security for Exchange