Can you create a connector to a smarthost that requires authentication on Exchange Online? I looked at the documentation for New-OutboundConnector, and I don't see a place to set the authentication credentials.
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Yes, I don’t know this setting, but we can use TLS : https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-for-secure-mail-flow-with-a-partner
May I know the function of this smart host? for filtering spam and malware or archiving or auditing?
You could refer to the following article: Manage mail flow using a third-party cloud service with Exchange Online https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/manage-mail-flow-using-third-party-cloud

Jayce
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