Configuring Scanning Settings; Configuring Container Settings - Symantec 10490452 - Mail Security 8220 Administration Manual

Configuring scanning settings

Configuring container 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.
Use the Scanning Settings page to configure container settings and content
filtering 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
Configuring email settings
Configuring scanning settings
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