You could ask the registrar/root domain admins to point those domains somewhere other than your server; or just delete them from the root servers at their perogative.  You might want to give your ex-customer a final warning beforehand as to your intent.  It might spur them into actionand maybe help deter any potential legal action after the fact.  I'm not a lawyer.  This is not legal advice.

- A

On 06/24/2018 01:30 PM, Alex wrote:
Hi,
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
something?

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

Unfortunately asking him nicely didn't work.
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