You can configure anonymous relay following:
Exchange 2016 Receive Connector Cannot Emails to External Domain
Namless Shelter
216
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Dear Friends,
I was trying to set up a Receive Connector on our Exchange 2016 server so we can relay Emails to External Domains. I remember as default it wont send Emails to External Domain..There is a powershell trick you can do to make it send Emails to External. Can anyone help me?
Thanks
ML