SPAM companies using a new (?) trick. Need help stopping

Greetings:

We've been noticing the following in the name server area of our log watch:

sysquery: query(NS1.ENCHANTINGIDEAS.NET) All possible A RR's lame: 1189 Time(s)

And noticing that this is being used to push SPAM through the system.

We have blocked the following at our firewall:

209.164.22.203 - NS1.ENCHANTINGIDEAS.NET
209.164.22.204 - NS2.ENCHANTINGIDEAS.NET

Along with every IP associated through their chain (do a dig on NS1.ENCHANTINGIDEAS.NET and follow up with other digs).

Yet, they still show up as a lame server.

How do we get rid of this SPAM organization?

Thank you.

 

 

 

 

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