How can I forbid DNS queries from an unwanted domain on my server?

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http://stackoverflow.com – Not sure my question's title is explicit, so I'll try and explain it the best I can. I have a dedicated web hosting server running Linux (Gentoo). There are a couple websites hosted on it, and therefore a couple domain names from multiple providers have their DNS zone settings set to point to my server. There is one particular website that used to be hosted on this server, but was then removed. However, it looks like its domain name is still pointing to my server. If I cat /var/log/messages : Jan 16 03:13:36 stock named[25829]: client XX.XX.XX.XX#XXXXX: query (cache) 'the-goddamn-domain.com (HowTos)