Enable Anti-Spam feature in Hub Transport
Open Exchange Management Shell
Go to the scripts folder, C:\Program Files\Microsoft\Exchange Server\V14\Scripts
Run the following Command:
./install-AntispamAgents.ps1
Restart MSExchangeTransport Service
Restart-Service MSExchangeTransport
Open Exchange Management Console (EMC)
Go to Organization Configuration -> Hub Transport -> Anti-spam
Right click “Sender Filtering” -> Properties -> Blocked Senders
Click Add… Add Individual e-mail address or Domain name
Click OK.
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