Spam consists of unwanted e-mail messages, usually sent by commercial, malicious, or fraudulent entities. The antispam feature examines transmitted e-mail messages to identify spam. When the device detects a message deemed to be spam, it blocks the e-mail message or tags the e-mail message header or subject with a preprogrammed string.
Antispam filtering allows you to use both a third-party server-based spam block list (SBL) and to optionally create your own local white lists (benign) and black lists (malicious) for filtering against e-mail messages. The antispam feature is not meant to replace your antispam server, but to complement it.
This chapter contains the following topics:
