1. Launch the Exchange Admin Center (EAC)
Click on the start button and expand Microsoft Exchange 2016 and click on Exchange Admin Center.
2. Login
Enter your credentials to login.
3. Click on Mail Flow
Click on Mail flow on the left and the default page to open is rules.
4. Click the + button
Click the + button and from the dropdown select "create a new rule".
5. Define rule
Enter in the criteria for the rule and click Save.