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4.2.4.3.2
Performance
In this section you can set the number of independent
scan threads used at a single time. More threads on
multiprocessor machines can increase the scan rate. For
the best program performance we advise using an equal
number of ThreatSense scan engines and scan threads.
The Response time limit (sec.) allows you to set the
maximum amount of time a thread waits for a message
scan to complete. If the scan is not finished within this
time limit, Microsoft Exchange Server will deny the client
access to the email. Scanning will not be interrupted and
after it is finished, every other attempt to access the file
will be successful.
TIP: To determine the Number of scan threads the
Microsoft Exchange Server provider recommends, use
the following formula: [number of physical processors] x
2 + 1.
NOTE: Performance is not improved significantly if there
are more ThreatSense scanning engines than scanning
threads.
4.2.4.4
Microsoft Exchange Server 2007/2010
(VSAPI 2.6)
This version of Microsoft Exchange Server includes VSAPI
version 2.6.
If the Proactive scanning option is enabled, new
inbound messages will be scanned in the same order in
which they were received.
The Background scanning option allows scanning of all
20
messages in the system background. Microsoft Exchange
Server decides whether a background scan will run or
not, based on various factors, such as the current system
load, the number of active users, etc. Microsoft Exchange
Server keeps a record of scanned messages and the virus
signature database version used. If you are opening a
message that has not been scanned by the most current
virus signature database, Microsoft Exchange Server
sends the message to ESET Mail Security to be scanned
before opening the message in your e-mail client. You can
choose to Scan only messages with attachment and
filter based on time received.
Since background scanning can affect system load
(scanning is performed after each virus signature
database update), we recommend using scheduled
scanning outside working hours. Scheduled background
scanning can be configured via a special task in the
Scheduler/Planner. When you schedule a Background
scanning task you can set the launch time, the number of
repetitions and other parameters available in the
Scheduler/Planner. After the task has been scheduled, it
will appear in the list of scheduled tasks and as with the
other tasks, you can modify its parameters, delete it or
temporarily deactivate the task.
Enabling the Scan RTF email bodies option activates
scanning of RTF message bodies. RTF message bodies
may contain macro viruses.
NOTE: Plain text email bodies are not scanned by VSAPI.
4.2.4.4.1
Actions
In this section you can specify the actions to take if a
message and/or attachment is evaluated as infected.
The Actions to take if cleaning not possible field allows
you to block infected content or delete the message. This
action will be applied only if the automatic cleaning
(defined in ThreatSense engine parameter setup >
Cleaning) did not clean the message.
The Message body deletion method option offers the
choice to either delete the message body or rewrite the
message body with action information.
Attachment deletion method lets you decide to delete
the message, truncate file attachment to zero size or
replace the infected file with action information.
If the Use VSAPI Quarantine option is enabled, infected
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