You can set a variety of global anti-spam options and options for specific anti-spam feature groups.
To configure the anti-spam options:
The Anti-Spam Options page is displayed.
Disable non-relay checks?: Use the drop-down list to select Yes or No. The default setting is No.
When set to Yes, only the first received headers (written by the last server to relay the message) are subject to DNS checks. This provides both performance improvements and fewer false positives because trusted relays, as defined in the Trusted Relay IPs list, are exempt from certain DNS checks. Click Edit trusted-relays to edit the Trusted Relay IPs list.
Disable All Network Checks?: Use the drop-down list to select Yes or No. The default setting is No.
When set to Yes, all types of network checks are disabled, including reverse DNS look-ups and other DNS checks. When set to No, individual network check rules can be enabled or disabled on the Anti-Spam Rules page.
Acceptable Character Sets: Select the character sets from the list of those available by Ctrl+clicking the ones considered to be "safe".
Certain anti-spam rules are triggered based on the character set of the message. The selected "safe" character sets are exempted from this group of rules. The default character set is read from the system's LANG environment variable. The available character sets are:
The Anti-Spam Options: <feature group> page is displayed.
The Anti-Spam Rules page for that feature group is displayed.
The Anti-Spam Rules page is redisplayed with the full list of rules.