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Unable to receive email to mailboxes, Error 451 4.4.0 DNS query failed...

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I just set up Exchange Server 2013 for my small business and have been unable to receive any email to the respective inboxes, however I have been able to send email. I have not changed any of the default receive connectors. It appears to be a DNS problem but I don't know how to fix it. My local DNS server is my domain controller. I don't know if this has anything to do with my problem, but my AD domain is hamlettcomputerservices.net, but my email domain name is hamletttechnologies.com. I have set exchange to use hamletttechnologies.com as the default accepted domain. I have tried sending email both from internal accounts on the server and from my personal email addresses but they just stay in queue until they expire and are returned.

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