At the heart of all
Trend Micro antivirus products lies a proprietary scan
engine. This engine has a long history in the industry and has proven to be one of
the
fastest.
The
ScanMail scan engine
is designed to work closely with the Virus Scanning Application
Programming Interface (VSAPI) 2.6 and 2.5 available from Microsoft
Exchange.
-
VSAPI provides a virus-scanning implementation with high
performance so that scanning occurs before a client can access a
message or attachment. This low-level access facilitates the elimination
of viruses/malware that file-level scanners cannot eliminate.
-
VSAPI enables message scanning once before delivery, rather
than multiple times as determined by the number of intended recipients, reducing
processing time. This single-instance scanning also prevents re-scanning
when a user copies a message.
The scan engine provides:
-
Real-time multi-threaded scanning
ScanMail
performs all scanning in memory and is capable of processing multiple scan requests.
When it
receives multiple scan requests, it prioritizes and queues the requests that it cannot
run
immediately and runs the requests when resources become available. When a manual or
scheduled
scan is running and a client attempts to access a scannable object, ScanMail performs an immediate
real-time scan.
ScanMail supports SMTP
real time email message scans.
-
Non-redundant scanning
When ScanMail
completes a scan of an object, it logs the object as scanned. If you access the object
again,
ScanMail checks to see if it has
already been scanned and does not scan it a second time.
