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Comment: [Original edit by JohnHardin] Add "public DNS" to "large ISP" warning

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However, if you have a large ISP who has many customers or are using a public DNS server having many users who are also doing DNSBL lookups, and the ISP / DNS host has not registered with the DNSBL provider as a paid client, the aggregate traffic from the ISP's those nameservers may exceed the free usage limits imposed by the DNSBL provider and lookups may start returning invalid results. This could lead to large numbers of incorrectly-classified messages.

If you have a large ISP or are using large public DNS provider(s) it is recommended you not forward mail-related DNS traffic through their DNS servers (though non-mail DNS traffic from your site shouldn't have problems.)