Question : E-Mail Problem

I am getting the following error: The mail server could not deliver mail to [email protected]. The account or domain may not exist, they may be blacklisted, or missing the proper dns.  I know that the domain exists because the domain I am sending to is my company email account. I can send to those on the same domain but when I send to outside email addresses I get this error.
I have "Googled" it but no answers.

Answer : E-Mail Problem

The nameservers were updated yesterday to resolve internal and external queries differently so that the errors DNSReports.com was issuing would be stopped. After updating and restarting bind, It appeared that everything was working correctly. However, there was a small error in the external view of the /etc/named.conf file that blocked the server from reaching outside domains. Internally, things looked fine until something tried to reach the outside world.