This guide describes how you can allow your trusted domains and IPs to bypass the Mimecast Web Security functionality by configuring exceptions.
To make the initial configuration process easier, customers have a default exceptions list created in their account with the TLDs listed below. Administrators can modify the list of default exceptions as required:
If you want more granular control over the domains you allow users to access, we recommend adding top-level domains / sub-domains to your allow / block lists in a domain filtering policy. See the Mimecast Web Security: Configuring a Block or Allow List Policy page for full details.
When configuring exceptions, consider the following:
- A domain added to your exceptions list won't connect with Mimecast. Any configured security policies are non-applicable and user activity is not logged.
- An IP added to your exception list works differently from a domain. A DNS request which resolves to an IP address found in the exception list, won't have any configured security policies applied. If logging is enabled, the activity is logged.
Managing Your Exceptions
To access your exceptions:
- Log on to the Administration Console.
- Click on the Administration menu item. A dropdown menu displays.
- Select the Web Security | Exceptions menu item.
Adding an Exception
To add a new exception:
- Click on the Add New Exception button.
- Complete the popout panel as follows:
Field / Option Description Name Add a description for the exception (e.g. Internal Subsidiary Domain). Type Select whether the exception is a "Domain" or "IP Range" from the drop down list. The relevant field is displayed. Domain Specify a domain name.Adding a domain as an exception also adds any of its subdomains as an exception. For example adding "acme.com" also adds "subdomain.acme.com". IP Range Specify the IP address / IP address range (in CIDR format) of a trusted domain.
- Click on the Add button.
To edit an exception:
- Click on an exception.
- Edit the fields as required.
- Click on the Save button.
Deleting an Exception
To delete an exception:
- Click on the icon to the right of the exception.
- Click on the Delete menu item. A confirmation dialog is displayed.
- Click on the Delete button to confirm the deletion.
- Click on the All down arrow next to the search field.
- Select one of the following filters:
- All: Searches all exceptions regardless of the type. This is the default.
- Name: Searches for the exception name.
- Domain: Searches for the domain name.
- IP Address / Range: Searches the IP address range.
- Enter your search criteria in theSearch field (e.g. name, domain, IP address).
- Press the Enter key or click on the search icon. Your results display.