From the GFI MailSecurity > Virus Scanning Engines node you can instruct GFI MailSecurity to stop virus scanning an item if a number of virus scanning engines already detected a virus in that item.
To enable this option, select the Stop virus scanning the current item, if viruses are detected by check box, and specify the number of virus scanners that need to detect a virus to stop virus scanning, in the box. Click
Apply.
If you want to streamline further the path taken by items containing a virus, select the Stop scanning even for non-virus related threats check box and click
Apply. This option will instruct GFI MailSecurity to stop further scanning of the current item, such as with Attachment Checking and so on, since the amount of virus-scanning engines you specified have detected a virus.