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SonicOS 5.8.1 Administrator Guide
• Create Access Rules in the relevant zones allowing only authorized SMTP servers on your
network to communicate outbound SMTP; block all other outbound SMTP traffic to prevent
intentional or unintentional outbound spamming.
• Create Access Rules in the relevant zones allowing authorized DNS servers on your
network to communicate with all destination hosts using DNS protocols (TCP/UDP 53). Be
sure to have this rule in place if you have DNS servers on your network, and you will be
configuring the restrictive DNS rule that follows.
• Create Access Rules in the relevant zones allowing Firewalled Hosts to only communicate
DNS (TCP/UDP 53) with sanctioned DNS servers; block all other DNS access to prevent
communications with unauthorized DNS servers.
• Unsanctioned access attempts will then be viewable in the logs.