[Declude.JunkMail] OT: find the domains that are using our DNS server

[Rick Baranowski]

Hello all,   Is there a way find out who has their domain registration set to our DNS servers?  We are going to drop one of the several domain names of our server and I need to notify them of the change.   We have several different names that come to the same server and I am not sure which customers are using the name that we are going to drop.   Thanks Rick