Do you run open resolvers, Noooo, we've had ACL's on bind for a long time. Only our subnets can do recursive queries.
This server does a lot of recursive queries as it's a mail server and has to check all those #%$#$% spam connections.
In case it's useful to know for future testing, F and I are the servers that you have the greatest chance of reaching locally.
Thanks, I'll keep that in mind for next time.
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Jean-Francois Pirus