Symantec Mail Security, Administration Manual

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56 Configuring email settings
Configuring invalid recipient handling
6 If you choose to exclude specific file classes, you can also select the types of
files in that class to be excluded in the
File Type list.
7
Click the Add File Classes or Add File Types button.
8 Click Save to store a list.
Configuring general settings
The Bloodhound level determines the way in which the system uses heuristics to
flag viruses. Symantec Mail Security uses Symantec Bloodhound™ heuristics
technology to scan for threats for which no known definitions exist. Bloodhound
heuristics technology scans for unusual behaviors, such as self-replication, to
target potentially infected message bodies and attachments. Bloodhound
technology is capable of detecting upwards of 80 percent of new and unknown
executable file threats. Bloodhound-Macro technology detects and repairs over
90 percent of new and unknown macro viruses.
Bloodhound requires minimal overhead because it examines only message
bodies and attachments that meet stringent prerequisites. In most cases,
Bloodhound can determine in microseconds whether a message or attachment is
likely to be infected. If it determines that a file is not likely to be infected, it
moves to the next file.
Lower heuristic levels may miss viruses, but consume less processing power,
potentially speeding incoming mail processing. Higher heuristic levels may
catch more viruses, but consume more processing power, potentially slowing
incoming mail processing.
To set the Bloodhound Level
1 Click Settings > Virus .
2 Under Bloodhound Level, click the High , Medium , Low , or Off button.
3 Click Save .
Configuring invalid recipient handling
By default, when an email message arrives addressed to your domain, but is not
addressed to a valid user, Symantec Mail Security for SMTP passes the message
to the internal mail server. The internal mail server may either accept the
message and generate a bounce message for that recipient, or the internal mail
server may reject the recipient, in which case Symantec Mail Security for SMTP
generates a bounce message for the recipient. Upon receiving the bounce
message, the sender can resend the original message with the correct address.