Symantec 10490452 Administration Guide - Page 57
Configuring scanning settings
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Configuring email settings 57 Configuring scanning settings However, messages with invalid recipients can also result from a spammer's directory harvest attack. You can drop all messages for invalid recipients using the Drop messages for invalid recipients action described below. There is a Remove invalid recipients action available on the Policies > Attacks > Directory Harvest Attack page that only removes invalid recipients if a directory harvest attack is occurring. These two settings can be combined or enabled individually. Note: Dropping messages for invalid recipients is an extreme measure. Enabling it may prevent diagnosis of serious problems with your email configuration, so only enable it after you're sure your email system is stable. Also, if enabled, even accidentally mis-addressed messages will be dropped, and no bounce message sent. The Remove invalid recipients action available on the Policies > Attacks > Directory Harvest Attack page is a less extreme measure. To configure invalid recipient handling 1 In the Control Center, click Settings > Invalid Recipients. 2 Do one of the following: ■ Uncheck Drop messages for invalid recipients to return bounce messages to the sender for invalid addresses. ■ Check Drop messages for invalid recipients to drop invalid messages from the mail stream and return no bounce messages to the sender. For this setting to take effect, a full synchronization and replication cycle must be completed. This setting is independent of the Directory Harvest Attack Email Firewall policy, and can be used in conjunction with it. 3 Click Save. Configuring scanning settings Use the Scanning Settings page to configure container settings and content filtering settings. Configuring container settings When Symantec Mail Security for SMTP processes certain zip files and other types of compressed files, these files can expand to the point where they deplete system memory. Such container files are often referred to as "zip bombs." Symantec Mail Security for SMTP can handle such situations by automatically