Important

Link Lock is enabled or disabled at the Customer level (default: enabled).

Link Lock settings are also edited and managed at the Customer level.

Settings are not inherited from the MSP level.

Link Lock provides protection against phishing, business email compromise, and zero day attacks by removing the possibility of a user selecting a malicious link in an email. Email Security does this by rewriting all links in every inbound email. Subsequently, when a link is clicked, Email Security can verify if the destination URL is safe or malicious. If the link is malicious, the user is presented with a block page indicating that there is a security risk.


With Link Lock, links always remain rewritten, even if an email is forwarded. Links are checked in real-time once clicked. Email Security allows you to exclude URLs from Link Lock by adding them to an allowed URLs (exemptions) list, which can be done at the MSP and customer levels.


Follow the steps below to configure Link Lock.


1. Go to Configuration > Link Lock at the customer level.

2. Select the Policy Configuration tab to configure your settings:

  • Follow redirection links: Select Yes to allow Link Lock to follow redirected URLs (up to a maximum of five). This protects against a legitimate URL redirecting to a malicious URL. Note that selecting this option may affect system performance
  • Display a button on the block page allowing a user to continue to the blocked site: Allows a user to continue to a blocked URL from the block page.
  • Display default logo on the block page: Displays the image currently being used on the Link Lock block page.
  • Use custom logo on the block page: When you select Yes, you'll be given the option to Choose File and upload a custom block page image. The following file formats are supported: PNG, JPG and JPEG. Maximum file size is 2048 KB.
  • Edit text on the block page: Select Yes to add a custom block page heading and/or message.

3. Select Save Changes.


Adding Link Lock exemptions

You can create exemptions to exclude URLs from Link Lock by adding them to an allowed URLs list. This can be done at the MSP and customer levels. To create a Link Lock exemption:


1. Go to Configuration > Link Lock at the customer level and open the Exemptions tab.

2. Click Add.

3. In the field Allowed URL, enter the URL you want to be exempt from Link Lock. 

4. Click Add.