User manual

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searching for the not examined objects runs in parallel.

A specific low priority thread is used for each database, which guarantees other tasks (e.g. e-

mail messages storage in the Microsoft Exchange database) are always carried out

preferentially.

Proactive Scan (incoming messages)

You can enable or disable the proactive scanning function of VSAPI 2.0/2.5 here. This

scanning occurs when an item is delivered to a folder, but a request has not been made by a

client.

As soon as messages are submitted to the Exchange store, they enter the global scanning

queue as low priority (maximum of 30 items). They are scanned on the first in, first out (FIFO)

basis. If an item is accessed while still in the queue, it is changed to high priority.

Note: Overflow messages will continue to the store unscanned.

Note: Even if you disable both Background Scan and Proactive Scan options, the on access

scanner will be still active when an user will try to download a message with the MS Outlook client.

Scan RTF

you can specify here, whether the RTF file type should be scanned or not.

Do not scan outgoing messages (MS Exchange 2007/2010) - with both VSAPI and Routing

Transport Agent (routing TA) server components installed (it doesn’t matter if it’s on one single

server, or two different ones), it may occur that outgoing mail is scanned twice. The first scan

is done by VSAPI On-access scanner, while the second one by the Routing Transport Agent.

This might cause certain server slowdowns and moderate delays in sending e-mails. If you’re

sure that you have both server components installed and active, you can choose to avoid this

double outgoing e-mail scanning by checking this box and disabling the VSAPI On-access

scanner.

Number of Scanning Threads

the scanning process is threaded by default to increase the

overall scanning performance by a certain level of parallelism. You can change the threads

count here.

The default number of threads is computed as 2 times the ‘number_of_processors’ + 1.

The minimum number of threads is computed as ('number of processors'+1) divided by 2.

The maximum number of threads is computed as 'Number of Processors' multiplied by 5 + 1.

If the value is the minimum or lesser value or the maximum or greater, the default value is

used.

Scan Timeout - the maximum continuous interval (in seconds) for one thread to access the

message that is being scanned (the default value is 180 seconds).

The Scanning properties section:

Use Heuristics - check this box to enable heuristic analysis method during scanning.

Report Potentially Unwanted Programs and Spyware threats - check this option to report

the presence of potentially unwanted programs and spyware.