dig +trace problem

[Carl Byington]

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On my system, 
  "dig mail.ymllabs.com +trace +recurse" 
returns 
  "couldn't get address for 'ns.cyberwebglobal.info': not found" 

Yet 
  "host mail.ymllabs.com"
after a bit of delay returns 210.212.104.19.

I thought the above dig command should return that ip address. Am I
misinterpreting the dig parameters, or is there something strange with
that name?

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