DNSBL: %s: Unknown Error responses for new RBL

Hi all,
   I've been trying to incorporate a new RBL whilst using BOPM and I continue 
to come up with the same issue.   The RBL I am trying to include is 
bogons.cymru.com.

The errors I get once adding it is along the lines of:
DNSBL -> Lookup error on dd.cc.bb.aa.bogons.cymru.com: Unknown error

The configuration of this RBL is done using the following in bopm.conf:

blacklist {
   name = "bogons.cymru.com";
   type = "A record reply";
   reply {
     2 = "Bogon/Unallocated IANA IP Address";
   };
   kline = "KILL %n :Bogon Internet Address (see http://www.cymru.com/Bogons/ 
for details)";
};

Now the key difference I can see is that all responses include a TXT object 
being "Contact Team Cymru <[email protected]> for questions.".

This is different to the normal NXDOMAIN response for RBLs such as 
opm.blitzed.org.

Does anyone have any suggestions to get around this?  I've tried looking 
through firedns.c to see if I could fine-tune it to ignore TXT responses but 
to no available (too tired; eyes kept glazing over reading through the 
firedns_getip function ;)).

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