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Exchange 2016 Unable to relay recipient in non-accepted domain

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Last Modified: 2020-01-14
Hi expert,

Outsider send email to our company email but it doesnt get deliver to exchange server.

I have check logs in D:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpReceive

it is showing Unable to relay recipient in non-accepted domain

Is there a receive / send connector i need to configure?
However, i try to send email from my personal hotmail to exchange, the email is received.

How can i resolve this?  why is this happening?
Thanks.
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