
This recipient could be a mailbox for your organization in Microsoft 365 or Office 365, or it could be a recipient on the internet. When this connector is set up, Microsoft 365 or Office 365 accepts messages from your organization's email server and send the messages to recipients on your behalf. To complete the scenario, you might need to configure your email server to accept messages delivered by Microsoft 365 or Office 365.Ī connector from your own email server to Office 365 To prepare for this mail delivery scenario, you must set up an alternative server (called a "smart host") so that Microsoft 365 or Office 365 can send emails to your organization's email server (also called "on-premises server").

When you set up Microsoft 365 or Office 365 to accept all emails on behalf of your organization, you will point your domain's MX (mail exchange) record to Microsoft 365 or Office 365.

If you have EOP and your own email servers, or if some of your mailboxes are in Microsoft 365 or Office 365 and some are on your email servers, set up connectors to enable mail flow in both directions. How do connectors work with my on-premises email servers? To learn more about partner scenarios, see Set up connectors for secure mail flow with a partner organization.

If you apply the steps described in this article to partner email services, you may have unintended consequences including email delivery failure. Before you get started, make sure to check on your specific scenario in I have my own email servers.
