Parking Domain Failure

I tried searching this out, but can't find anything that is the exact same as my issue, so sorry for the repost if any. I'm running a Wordpress multisite with the domain mapping plugin, it is live and working, but now we need to add email accounts for each domain. I've researched and found that if I can park the domains in the Cpanel account I should be able to select each domain from a drop down in the email setup process. For example questions@site1.com questions@site2.com questions@site3.com etc... But I get the following message when trying to add a parked domain:
Sorry, the domain is already pointed to an IP address that does not appear to use DNS servers associated with this server. Please transfer the domain to this servers nameservers or have your administrator add one of its nameservers to /etc/ips.remotedns and make the proper A entries on that remote nameserver.
All domains are set to the same nameserver addresses: site1.com ns1.dns.com ns2.dns.com ns3.dns.com --------------------------------------- site2.com ns1.dns.com ns2.dns.com ns3.dns.com --------------------------------------- site3.com ns1.dns.com ns2.dns.com ns3.dns.com --------------------------------------- site4.com ns1.dns.com ns2.dns.com ns3.dns.com The A records for each site are also all set to the same IP. So I'm not sure why it's saying the DNS servers are in a different location. The CPanel account settings have been enabled to allow up to 5 parked domains. I didn't think I should turn on the "Allow Remote Domains" because I don't think they're remote and it seemed like a security risk. Does anyone have any ideas?