| 摘要 |
<p>A method of preventing the infection of a computer network 1 by a computer virus, where that virus can be spread by e-mail traffic. The method comprises installing at an e-mail gateway 7 of the network an anti-virus application 12, which application scans at least incoming e-mail traffic for known viruses. In the event that a new virus is detected by the provider of the anti-virus application 12, a notification of this event is sent from the provider to the anti-virus-application 12, the notification including a checksum calculated for the file or file part containing the virus. At the anti-virus application 12, receipt of said notification results in the screening of emails using the checksum. When a signature is subsequently provided to the gateway, this screening is terminated and scanning commenced using the signature.
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