Note This issue also occurs in Microsoft Exchange Server 2013, and you can follow the Workaround section to fix the issue for Exchange Server 2013.
- Method 1
Add the default accepted domain as a secondary SMTP address to the Default Policy email address policy.
For more information, see Edit an email address policy.
- Method 2
Change the default accepted domain to match the primary SMTP address in the Default Policy email address policy.
For more information, see Set-AcceptedDomain.
Article ID: 3208840 - Last Review: 13 Dec 2016 - Revision: 1