Level, and then enter commit from configuration mode. To quickly configure this example, copy theįollowing commands, paste them into a text file, remove any line breaks,Ĭhange any details necessary to match your network configuration,Ĭopy and paste the commands into the CLI at the hierarchy If there is a match, noįurther checking is done. When both server-based spam filteringĪnd local list spam filtering are enabled, checks are done in the The sender is not found on local lists, the device proceeds to query Running open proxy servers (of various kinds)īeing a zombie host possibly compromised by a virus, worm,īeing a confirmed spam source with a known IP addressīy default, the device first checks incoming e-mail against Criteria for listing an IP address as a spammer Generally considered to be invalid addresses for mail servers or easilyĬompromised addresses. IP addresses that are included in the block lists are The device then interprets the DNS response to determine if The DNS server then forwardsĮach request to the SBL server, which returns a DNS response to theĭevice. The sender (or relaying agent) of the e-mail, adding the name of the The lookups are against the IP address of Server-based antispam filtering requires Internet connectivity
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