NDRs cant send emails out

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    I have a exchange 2016 server that i just stood up and i am unable to send emails internally to another exchange in another forest, and i cant send mail to my environment from the outside. I know i can reach my exchange server from the outside because owa works. I posted the NDR below

    Now i am sending this email from my functional exchange 2010 server, to my new exchange 2016 server in another forest. There is a domain trust set up between my DCs
    [SIZE=10px]Diagnostic information for administrators:[/SIZE]
    [SIZE=10px]Generating server: CAS01.rowancompanies.com[/SIZE]
    [SIZE=10px][email protected]
    #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
    [/SIZE]

    [SIZE=10px]Original message headers:[/SIZE]
    Received: from MAILBOX01.rowancompanies.com ([fe80::288e:681a:c8f9:c547]) by CAS01.rowancompanies.com ([172.18.1.252]) with mapi id 14.03.0361.001; Mon, 26 Feb 2018 08:12:45 -0600 Content-Type: application/ms-tnef; name=”winmail.dat” Content-Transfer-Encoding: binary From: AROTest 4 To: “[email protected] Subject: Testing 8:12 Thread-Topic: Testing 8:12 Thread-Index: AdOvC99rZLt+dOIqTz2wXcnjma7wiw== Date: Mon, 26 Feb 2018 08:12:45 -0600 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: MIME-Version: 1.0

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