Overriding a single record with dynamic-dns

[gnafou]

Hello 
I have a zone myzone.com where dynamic dns is active ( dhcp updates continuously the dns ) 
I need to respond differently for MX requests  such as : 
MX for "internal"   queries  is    mxinternal.myzone.com MX for "internet"  queries   is   mxexternal.myzone.com 


I cannot find out how to setup bind to achieve this  while keeping the dynamic dns in operation 

Sincerely
Fred


( i use bind 9.9.5  ) 
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