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It could be a side effect of Verisign's "this domain doesn't exist, would you like to buy it?" shenanigans. It's hard to test that a domain exists when you're no longer getting useful responses. That could break quite a few spam filters.
It came out a day or so ago, for all three supported versions of BIND. Someone upstream of you has to apply it and then change the configuration file to ignore the synthesized requests.
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