Configure on-premises email server send connector to Office 365 (It will be added automatically if you were using Full Hybrid configuration)

  1. Logon to on-premises exchange server.
  2. Open the Exchange Management Console.
  3. In the console tree, expand Organization Configuration, select Hub Transport, and then in the work pane, click the Send Connectors tab.
  4. In the action pane, click New Send Connector. The New SMTP Send Connector wizard starts.
  5. On the Introduction page, type name in the Name field and then select Internet in the Select the intended use for this connector field, click Next.

6. On the Address space page, click +Add….

7. Make sure Type is SMTP and the type office365 tenant domain name.mail.onmicrosoft.com in the Address space field.

8. Make sure Cost is 1, click OK and then click Next.

9. On the Network settings page, select Route mail through the following smart hosts. if you have no smart hosts, keep settings as default (bypass step 10 to 12) and then click Next.

10. Click +ADD…, select Fully qualified domain name (FQDN).

11. Type smart host name, click OK and then click Next.

12. On the Configure smart host authentication settings page, click Next.

13. On the Source Server page, make sure added every Hub Transport servers and then click Next.

14. On the New Connector page, click New.

15. Click Finish on the Completion page.

Note
If mail flow to Office365 hosted users is slow when the server points to a Smart Host on Exchange, the you can open Exchange management Shell and run follow command.

Set-SendConnector -identity 'Outbound to Office365' -RequireTLS $False -RequireTLS $False -TlsAuthLevel $NULL -TlsDomain $NULL -ErrorPolicies Default

Hope you enjoy this post.

Cary Sun

TWITTER:@SifuSun

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