
44CHAPTER 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 |
| are designed to attack mail servers directly. These types of messages are |
| often used in |
| 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 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.