Symantec 10490452 Administration Guide - Page 58
Configuring content filtering settings
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58 Configuring email settings Configuring scanning settings sidelining large attachments and cleaning them. There is a presumption that such a file can be a zip bomb and should not be allowed to deplete system resources. The file is sidelined for cleaning only because of its size, not because of any indication that it contains a virus. You can specify this size threshold and the maximum extraction level that Symantec Mail Security for SMTP will process in memory, as well as a time limit for scanning containers. If the configured limits are reached, Symantec Mail Security for SMTP will automatically perform the action designated for the "unscannable" category in the Group Policies settings. To configure container settings 1 In the Control Center, click Settings > Scanning. 2 Under Container Settings, specify a number in the Maximum container scan depth box. A container is unscannable for viruses if the nested depth in a container file (such as a .zip file or email message) exceeds the number specified. Do not set this value too high or you could be vulnerable to denial of service attacks or zip bombs, in which huge amounts of data are zipped into very small files. 3 Specify a number in the Maximum time to open container box and click Seconds, Minutes, or Hours. A container is unscannable for viruses if the specified time elapses when scanning containers (such as .zip files). Use this setting to detect containers that don't exceed the other container settings, but yet include container nesting, many files, large files, or a combination of these. 4 Specify a number in the Maximum individual file size when opened box and click KB, MB, or GB. A container is unscannable for viruses if any individual component of the container when unpacked exceeds the size specified. 5 Specify a number in the Maximum accumulated file size when opened box and click KB, MB, or GB. A container is unscannable for viruses if the total size of all the files in a container when unpacked exceeds the size specified. 6 Click Save. Configuring content filtering settings In addition for checking plain text files against words as defined in contentrelated policies, Symantec Mail Security for SMTP can check attachments against these dictionaries that are not plain-text files. While such checking