Administrator's Guide - Kerio Software Archive

Chapter 17Antivirus Control of Email And Attachment FilteringIn Kerio MailServer, you can check all incoming emails for viruses. The control can be performedby using two combinable methods. For this purpose, you can use either the internalMcAfee antivirus, or any of the external supported antiviruses.Immediately after the installation of Kerio MailServer, the internal McAfee antivirus is started.It is possible to support it by enabling any other of the supported external antivirus applications.Both antivirus programs can run concurrently. This provides for reliable protectionof your local network, since the virus databases updates will be performed faster (one of theantiviruses can react to a new virus occurrence a couple of hours sooner than the other). Theupdate speed is a key element of the protection against new viruses.Both antiviruses can be also switched off, but it is not recommended, because users are notprotected against infected emails.Kerio MailServer checks (independently of the antivirus) JPEG attachments for corruption andpresence of GDI+ exploit (a malicious code, usually with a virus, that can run the exploit uponsystem breakdown). All messages with such attachment will be deleted automatically.Figure 17.1Antivirus196