When you try to relay emails Internal email works fine however unable to send emails to external domains.
Error:
Solution:
Get-ReceiveConnector “ServerCAS01\App Connector” | Add-ADPermission -User ‘NT AUTHORITY\Anonymous Logon’ -ExtendedRights MS-Exch-SMTP-Accept-Any-Recipient
After the change:
![](https://mxcloudpro.com/wp-content/uploads/2020/06/relay2.jpg?w=1014)
Thanks