query (cache) 'coriander.plus.com/A/IN' denied

[Carl Fretwell]

We have a domain which we serve dns for but we don't handle mail for this client. However in the log file I can see all the time that there mail server is trying to run a query on our dns server but is being denied.

The log message

20-Mar-2009 16:32:54.984 security: info: client 95.102.17.107#14080: query (cache) 'coriander.plus.com/A/IN' denied

And in the clients zone file we have

@               IN   MX       10         coriander.plus.com.

Is this anything to worry about? How can I determine if the client is receiving email - without asking - because these appear in the log all the time.

Regards

Carl
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