How to not log "cache denied" error?

[Secmas]

Hi,
I need your help, my file MESSAGES is getting really big due to a thousands of similar errors:

Sep 23 14:34:20 server named[27034]: client 64.237.96.11#13318: query (cache) 'domain.com/A/IN' denied

Is there a way to not log this? I know that this shows that my FireWall is working, so, I don't need this in my MESSAGE file.

On the other hand, I have read that rndc flush, could help, Is it true?

Any idea?

Your help is appreaciated.

Regards.

[Secmas]

Nobody knows?