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Mailflow between 2010/2013

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    Have an existing 2010 exchange server and a new 2013 server that I have installed in a different AD site. I can telnet on 25 between the two. 2013 shows all the 2010 info in the EAC. I can access 2010 mailboxes through the 2013 owa. I created test user in 2013 and can send out, but I can’t recieve in or send mail internally between the two servers. I have a barracuda on the edge at the 2010 site. Am i missing something? I thought once I installed a newer version that they would automatically proxy? if i go into 2010 queue viewer theres a queue with the AD site name with the messages

    the Delivery type is SMTP Relay to remote active directory site, the error i get is

    451.4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain

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