troubleshooting Question

External E-mail as Contact Sending E-mail to Internal Distribution Group

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swgitFlag for United States of America asked on
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Dear Experts,

I am having a hard time getting an external user to send e-mail to a distribution group internally.  I created a contact for him in my domain with his eternal e-mail and added him to the distribution group.  However, every time he sent an e-mail to the group, he got bounced back with undeliverable.  Exchange 2010 / 2008 DC / Outlook 2016.  Thanks.
Adam Brown
Cloud Security Consultant

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