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  1. Hi, I have installed MS Exchange 2016 in my lab. I can send emails internally just fine but not able to send emails externally. My AD Domain: Domain.com My Public Domain: DomainInc.com.au Error message I get when I send emails externally meaning to gmail, aol or yahoo: Generating server: EXCH-SRV01.domain.com username@aol.com Remote Server returned '400 4.4.7 Message delayed' Original message headers: Received: from EXCH-SRV01.domain.com (10.X.X.X) by EXCH-SRV01.domain.com (10.X.X.X) with Microsoft SMTP Server (TLS) id 15.1.225.42; Sat, 27 Feb 2016 04:56:17 -0800Received: from EXCH-SRV01.domain.com ([::1]) by EXCH-SRV01.domain.com ([::1]) with mapi id 15.01.0225.041; Sat, 27 Feb 2016 04:56:17 -0800From: Exchange Admin Account <adm_exchange@domain.com>To: username@aol.com username@aol.comSubject: testThread-Topic: testThread-Index: AQHRcV47KRzLbFmdUEagAG9gVscc+A==Date: Sat, 27 Feb 2016 12:56:16 +0000Message-ID: <5c6080469f5a41c3b2e8bc8be3a3d88b@genesys.com>Accept-Language: en-USContent-Language: en-USX-MS-Has-Attach: yesX-MS-TNEF-Correlator:x-originating-ip: [10.X.X.X]Content-Type: multipart/related; boundary="_004_5c6080469f5a41c3b2e8bc8be3a3d88bgenesyscom_"; type="multipart/alternative"MIME-Version: 1.0 I have registered a domain with crazydomains and also purchased a dns and email address to verify my domain for SSL certificates. Created an A Record : mail.domainname.com.au --> pointing to my public domain ip address. Created another A Record: autodiscover.domainname.com.au --> pointing to my exchange server EXCH-SRV01.domain.com (AD Domain) Created an MX record: mail.domainname.com.au --> pointing to mail.domainname.com.au My SSL Certificate has the following under Subject Alternative Name: DNS Name=mail.domainname.com.au DNS Name=autodiscover.domainname.com.au DNS Name=domainname.com.au Is this configured incorrectly? I have been stuck with this for a while and tried many google searches to find a resolution with no luck. Any help would be appreciated. Thanks.
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