Configuration - Partial Domain Support

This article contains information on configuring partial domain support during the Mimecast Email Security Cloud Integrated Trial, including steps to restrict mail to specific groups and update settings to limit email scanning scope.

Overview 

During the Mimecast Email Security Cloud Integrated Trial, you can restrict mail sent to your organization, by using the partial domain support feature. This will reduce any risk should something go wrong during their evaluation of Mimecast Email Security Cloud Integrated.

Functionality

If you want to evaluate the product's efficacy before full deployment specifically, you can email a specific group, and Mimecast will scan it. This can be selected and enabled during the PROTECT MODE decision during installation or through the Configuration menu after installation.
Mimecast allows you to update this anytime should they want to limit the scope of emails that Microsoft 365 sends to Mimecast for scanning. When making a change, allow at least 5 mins to take effect. This is because Mimecast updates the Exchange Rules only to allow emails for individuals in the selected Target Groups.

Supported Groups:

• Microsoft 365.

• Distribution List.

Configuring Partial Domain Support

You can configure Partial Domain Support, by using the following steps:

1. Log in to Mimecast Email Security Cloud Integrated.
2. Navigate to Configuration on the Mimecast Menu
3. Click Service Authorization
4. Select Settings
5. Select either All Internal users or Groups (see screenshot below)

Below is a screenshot of how the groups can be selected.

If Groups is selected, search for Group(s) and click on the desired groups to add to the list. More than one can be added.