Run Exchange Management Shell as administrator and run the Get-SendConnector cmdlet. Let’s get the outbound send connectors in the organization.
Important: We recommend doing the below change in production environments outside of business hours in case of some impact on your normal mail flow. In our example, we will configure outgoing mail via Exchange Online before we migrate mailboxes to Office 365. You can change the outgoing mail via Exchange Online: It’s already included in the Exchange Online subscription license, and this way, you don’t need a third-party spam filter for extra costs. Organizations often want to use Exchange Online for outbound mail because of Exchange Online Protection (message hygiene). The message does not traverse through Exchange Online. Inspecting the headers from an on-premises mailbox user to a Gmail address in Message Header Analyzer, we can see that route from the on-premises server directly to Google servers. This means that when an on-premises mailbox user sends an email, the shortest route to the internet is to use that connector. Right now, the on-premises Exchange organization has a send connector for outbound mail to the internet. Restart Microsoft Exchange Transport service.
Add send connector for outbound mail via Office 365.Get Exchange on-premises send connectors.
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