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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.
4.2.4.3
Microsoft Exchange Server 2003 (VSAPI
2.5)
This version of Microsoft Exchange Server includes VSAPI
version 2.5.
If the Proactive scanning option is checked, new
inbound messages will be scanned in the same order in
which they were received.
The Background scanning option allows scanning of all
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.
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
18
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.
If you want to scan plain text messages, select the Scan
plain text email bodies option.
Enabling the Scan RTF email bodies option activates
scanning of RTF message bodies. RTF message bodies
may contain macro viruses.
The Scan transported messages option enables
scanning for messages that are not stored on the local
Microsoft Exchange Server and are delivered to other e-
mail servers through the local Microsoft Exchange Server.
If scanning for transported messages is enabled, ESET
Mail Security also scans these messages. This option is
only available when the transport agent is disabled.
NOTE: Plain text email bodies are not scanned by VSAPI.
4.2.4.3.1
Actions
In this section you can specify the actions to be
performed 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 (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.
By activating Rescan, you can scan the messages and
files that have already been scanned again.
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