Adding Office 365 Outbound Connectors

To configure outbound connectors, ensure that you have an Office 365 administrator account.

Some organizations use Microsoft Office 365 to remotely host their email architecture, allowing Microsoft to manage the day-to-day aspects of maintaining their email servers. Hosted Email Security integrates with Office 365 to provide additional security and benefits.

Configure Office 365 connectors to allow email traffic to and from Hosted Email Security MTAs.


Consult the Microsoft Office 365 help for information about adding connectors. Some Office 365 plans do not offer connectors.

  1. Log on to your Office 365 administration center.
  2. Go to Admin centers > Exchange

    The Exchange admin center screen appears.

  3. In the navigation on the left, go to mail flow, and then click connectors in the top navigation.
  4. Do the following to add an Outbound Connector to Office 365:

    By adding an outbound connector, you can configure Office 365 to relay outbound mail to Hosted Email Security for filtering and delivery to recipients outside of your Office 365 managed domain.

    1. Click the plus (+) icon.

      A new connector configuration screen appears.

    2. In the From field, select Office 365.
    3. In the To field, select Partner organization.
    4. Click Next.
    5. In the Name field, type a descriptive name for the connector.

      For example, type Hosted Email Security (Outbound).

    6. Select the Turn it on check box.
    7. Click Next.
    8. Select Only when I have a transport rule set up that redirects messages to this connector, and then click Next.
    9. Select Route email through these smart hosts, click the plus (+) icon, and then add the following host to the list:

      Europe, the Middle East, Africa:

      All other regions:

    10. Click Next.
    11. Keep the default settings on the screen that appears, and click Next.

      The New connector confirmation screen appears, displaying all the settings that you have configured.

    12. Click Next.
    13. Add an email address to the field provided, and then click Validate.

      After the validation process completes, the Validation Result screen displays.

    14. Click Save.
  5. Add an email flow rule to use the outbound connector you created.
    1. In the navigation on the left, go to mail flow, and then click rules in the top navigation.
    2. Click the plus (+) icon and click Create a new rule.
    3. In the Name field, type a name for the rule, for example, Hosted Email Security (Outbound).
    4. Under Apply this rule if..., select The recipient is located and then Outside the organization and click OK.
    5. Click More Options at the bottom to show more settings.
    6. Under Do the following..., select Redirect the message to and then the following connector and choose the outbound connector you created for message redirection.
    7. Configure the remaining fields if necessary; otherwise, keep the default settings for them.
    8. Click Save.