Public DNS Record

hello everyone !!!
                              i am implementing exchange 2016 on server 2012 r2 for testing. i am able to send email from one mailbox to another in my local network. all i need to configure my public dns and local dns record. my email also not delver from my exchange to other domain like gmail. i got the following massage.

Delivery is delayed to these recipients or groups:

mohit.saini101@gmail.com (mohit.saini101@gmail.com)

Subject:

This message hasn't been delivered yet. Delivery will continue to be attempted.

The server will keep trying to deliver this message for the next 1 days, 19 hours and 59 minutes. You'll be notified if the message can't be delivered by that time.

Diagnostic information for administrators:

Generating server: EXCNLG.CONTROLPRINT.LOCAL

mohit.saini101@gmail.com
 Remote Server returned '400 4.4.7 Message delayed'


Original message headers:
Received: from EXCNLG.CONTROLPRINT.LOCAL (192.168.1.237) by
 EXCNLG.CONTROLPRINT.LOCAL (192.168.1.237) with Microsoft SMTP Server (TLS) id
 15.1.225.42; Thu, 15 Mar 2018 16:31:52 +0530
Received: from EXCNLG.CONTROLPRINT.LOCAL ([::1]) by EXCNLG.CONTROLPRINT.LOCAL
 ([::1]) with mapi id 15.01.0225.041; Thu, 15 Mar 2018 16:31:52 +0530
From: mohit saini <mohit.saini@controlprint.xyz>
To: "mohit.saini101@gmail.com" <mohit.saini101@gmail.com>
Subject:
Thread-Index: AQHTvEDbtJyYA/WnZ0umgkO0ytMrhQ==
Date: Thu, 15 Mar 2018 11:01:52 +0000
Message-ID: <0caece0418c843bcae766738f3efdfe1@controlprint.xyz>
Accept-Language: en-US, en-IN
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-messagesentrepresentingtype: 1
x-originating-ip: [192.168.1.236]
Content-Type: multipart/alternative;
      boundary="_000_0caece0418c843bcae766738f3efdfe1controlprintxyz_"
MIME-Version: 1.0

please assist me and sorry for my bad English, awaiting for  your valuable reply
mohit sainiAsked:
Who is Participating?
 
MAS (MVE)EE Solution GuideCommented:
Hi Mohit,
Welcome to Experts Exchange.
Few things to check.
1. First make sure your server has Internet. Make sure you have a internal to external NAT configured for Exchange server Public IP.
2. Ensure NIC is configured with internal DNS server which is integrated with AD.
3.Configure External DNS server  for external lookup (Your ISP DNS server preferred).  
https://practical365.com/exchange-server/exchange-2013-manually-configure-dns-lookups/
4. Configure Send connector for send mail out.
https://practical365.com/exchange-server/exchange-2016-outbound-mail-flow/
5. Configure Receive connectors to receive emails.
https://practical365.com/exchange-server/inbound-mail-flow-for-exchange-server-2016/
2
 
MAS (MVE)EE Solution GuideCommented:
Enough information to confirm answer.
0
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