Stopping name server abuse

Alex mysqlstudent at
Sun Jun 24 20:30:08 UTC 2018

We had a former customer who parked about 300 domains with his
registry on our server but is no longer a customer and hasn't moved
his domains. There aren't any hosts behind the domains.

Is there anything more I can do to block/prevent them from continually
querying my system outside of just redirecting them to localhost or

It's not a terrible amount of traffic, but it's pretty substantial.

Unfortunately asking him nicely didn't work.

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