Problem with DNS and Addon Domains after transferring accounts

I need help! my client asked me to move all their sites to a new server. he had a reseller account in another hosting but I contract a dedicated server. I used the tool ("COPY") of cpanel to move the sites. the sites moved perfectly. the emails also moved But the problems are the following: 1) "When trying to send or receive emails, it gives an error" check the DNS zones and point to the old servers still. (I do not know how I could repair it) 2) In addition the Addon Domains have disappeared (but their dns zones are still created) somebody could help me? I do not have good English ... excuse me