I disabled the Five-ten blacklist and the errors stopped. I re-enabled it and they started up again. So, disabling the five-ten blacklist is my fix? I'm not sure what this means.
The problem seems to be a combination of FIVETEN (which has packets that are awfully close to the 512 byte limit of UDP) and IMail (which does lookups using non-standard queries). I would again recommend disabling TCP in IMail v8's anti-spam settings.
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