HP Email Firewall Appliance Series Manual do Utilizador descarregar pdf (Página 44)

44 CHAPTER 3: CONFIGURING MAIL SECURITY

Malformed Email Many viruses try to elude virus scanners by concealing themselves in

malformed messages. The scanning engines cannot detect the

attachment and pass the complete message through to an internal

server.

Some mail clients try to rebuild malformed messages and may rebuild or

activate a virus-infected attachment. Other types of malformed messages

are designed to attack mail servers directly. These types of messages are

often used in denial-of-service (DoS) attacks.

The 3Com Email Firewall analyzes each message with very extensive

integrity checks. Malformed messages are quarantined if they cannot be

processed.

Select Mail Delivery -> Malformed Email from the menu to configure

malformed email checks.

■ Enable malformed scanning — Select this option to enable scanning

for malformed emails.

■ Enable NULL Character Detect — Select this option to enable null

character detection. Any messages with null characters in them (a byte

value of 0) will be considered a malformed message.

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HP Email Firewall Appliance Series Manual do Utilizador Página 44