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Selecting an e-mail security level
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Active Virus Shield protects your e-mail on one of the following levels:
High -
the level with the most comprehensive monitoring of incoming and outgoing e-mails. When set to high, Active Virus Shield scans e-mail attachments in detail regardless of the time of the scan, including for archives.
Recommended -
When set to this level, Active Virus Shield scans the same objects as High, with the exception of attachments or e-mails that will take more than three minutes to scan. This is the default level of e-mail security.
Low -
When set to this level, Active Virus Shield only scans your incoming e-mail. Archives and e-mail attachments that take more than three minutes to scan are not scanned. It is recommended that you only use this level if you have additional e-mail protection software installed on your computer.
You can raise or lower the e-mail security level.
In order to change the security level,
Adjust the sliders. By altering the security level, you define the ratio of scan speed and the total number of objects scanned. The fewer e-mail objects that are scanned, the higher the scan speed.
If any of the pre-installed levels does not fully meet your needs, you can alter its settings and create a User defined security level.
Example:
Your computer is outside of the local network and uses a dial-up Internet connection. You use Microsoft Outlook Express as a mail client for receiving and sending e-mail, and one of the free e-mail services as a mail service. Your mail contains archived attachments. How do you maximally protect your computer from infection through e-mail?
Tip for selecting a level:
Because you have no centralized e-mail protection and are using a dial-up Internet connection, one can come to the conclusion that danger of a malicious program infecting your computer through e-mail in the scenario outline is high.
Therefore, it is recommended that you use High as your basic pre-installed security level, and reduce the scan time for attachments, for example, to 1-2 minutes.
To modify the settings for a preconfigured security level,
click the 
Customize button in the E-mail Anti-Virus settings window. Edit the mail protection settings in the window that opens and click OK.
Also see:
Selecting a protected e-mail group
Selecting actions for dangerous e-mail objects