Installation instructions

GFI MailSecurity for Exchange/SMTP Configuring virus checking  61
Screenshot 53 – VSAPI scan settings
4. From the VSAPI Settings tab, you can enable background
Information Store Scanning, by selecting the Enable background
scanning check box. This option will cause all the contents of the
Information Store to be scanned, which depending on the amount of
items stored in the Information Store could result in a huge processing
load on the Exchange server. For this reason, it is recommended that
this option be only enabled during periods of low server activity such
as during the night.
5. Select a VSAPI scan method from the following:
 On-access scanning – New items in the Information Store are
scanned as soon as they are accessed by the email client. This
scan method will thus introduce a short delay before the email
client can display the contents of a new message.
 Pro-active scanning – New items added to the Information Store
are added to a queue for scanning. When a mail client tries to
access an item that is still in the queue, it will be allocated a higher
scanning priority so that it is scanned as soon as possible. This is
the default and recommended mode of operation, since in general
the delay associated with on-access scanning is avoided because
new items are added to the queue immediately and are usually
scanned before a mail client requests access to the item.