Configuring Inbound Gateways

Modified on Wed, 1 Sep, 2021 at 3:57 PM

Configuring inbound gateways on Microsoft 365 allows email flowing through EntrustedMail to bypass certain spam filters and spam block lists on the Microsoft gateways.  This does the following:

  • Allows inbound email from the Secure Message Portal to be properly delivered to your domain
  • Reduce the chance of inbound encrypted email being marked as Spam
  • Reduce temporary deferments caused by intra-domain email routed through EntrustedMail

The following instructions apply if you have Classic EAC or New EAC

Classic Exchange Admin Center

  1. Under Protection select Connection Filter.
  2. Under Protection
  3. Edit the default policy.
  4. Add the IP ranges for the Inbound Gateway found in your Welcome E-mail, one CIDR range at a time, and press SAVE.

New Exchange Admin Center

  1. Navigate to Mail flow > Connectors. The Connectors screen appears.

  2. Click +Add a connector. The New connector screen appears.

The screen on which the process to create a connector begins

  1. Under Connection from, choose Partner organization.


Once you select the Partner organization radio button under Connection from, the option under Connection to is greyed out, implying that Office 365 is chosen by default.

The screen on which a connector is set up to apply security restrictions

  1. Click Next. The Connector name screen appears.

  2. Provide a name for the connector and click Next. The Authenticating sent email screen appears.

  3. Choose one By verifying that the IP address of the sending server matches one of the following IP addresses, which belong to your partner organization. Enter the IP Ranges provided to you in your onboarding email or a helpdesk ticket.

  4. Click Next. The Security restrictions screen appears.

  1. Check the check box for Reject email messages if they aren't sent over TLS.

  2. Ensure this box remains unchecked:  Reject email messages if they aren't sent from within this IP address range

  3. Click Next. The Review connector screen appears.

  1. Review the settings you have configured, and click Create connector.

The connector is created.

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