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Comment: A little more detail on non-forwarding, with a heading

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However, if you have a large ISP 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 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.

Non-forwarding

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.) With bind, this means not having any "forwarders" listed.