User Guide

Advanced settings 51
6.1.2. iChecker technology
While performing anti-virus scan, the application may use iChecker technology
(parameter UseIChecker section [smtpgw.ave]) that eliminates the need to scan
identical objects each time they are detected in the flow of email messages and,
if possible, perform only one comparison with the existing data.
The object (file) anti-virus scan algorithm will be changed as follows:
When a message is scanned for the first time (if it has been flagged as Clean),
data about the message (name, checksum, date, etc) is saved to the iChecker
database. The database path is defined by the ICheckerDBFilename option in
the [smtpgw.options] section.
Next time the message is sent to the AV module for scanning
, the application
first looks for this file in the iChecker database by name. If it finds a match, the
current object is compared with the database record. If the current status of the
object and its description in the database are fully identical, then the object is
considered to remain unchanged and is not scanned for viruses.
To have the application use the iChecker technology, set the UseI-
Checker parameter in the [smtpgw.ave] section to true.
6.1.3. Setting up application timeouts
All timeout settings are located in the [smtpgw.timeouts] section of the
application configuration file.
By setting up various timeouts, the administrator can:
• Limit the maximum period after which the application will attempt to
deliver outgoing messages that have not been sent yet (Maximal-
BackoffTime parameter, in seconds).
• Define the time between attempts to deliver outgoing messages that
have not been sent yet (MinimalBackoffTime parameter, in sec-
onds).
• Specify the interval (in days) during which the application will try to de-
liver a message with the frequency defined by the MinimalBack-
offTime parameter (MaximalQueueLifetime option). After this period
elapses, the unsent message will be removed from the ready-to-send
queue. If necessary, a DSN message on the initial message delivery
failure will be generated.