Secure Messaging - Apply on Message Recipients

This article contains information on applying Secure Messaging policies in Mimecast based on message recipients, including setup steps, sender/recipient selection, and policy activation for secure internal-to-external communication.

When using Secure Messaging, you will likely want to enforce the feature for messages sent to specific recipients, for example, a domain or a named group of recipients. This article outlines how to apply Secure Messaging to messages based on the message's recipient.

What You'll Need

• A Mimecast admin account with permissions to the Policies | Gateway Policies menu.
• At least one Secure Messaging definition. If you have not already set up a definition, view the Configuring Definitions and Policies article.

Walkthrough

1. Log in to the Mimecast Administration Console.
2. Navigate to Policies | Gateway Policies.
3. Click on Secure Messaging from the list of policy types on the page to view any policies already created.
4. Click the New Policy button from the menu bar.
5. Enter a description of the policy in the Policy Narrative text box.
6. Use the Lookup button to select the Secure Messaging definition that should apply when the policy is triggered.
7. Select which senders and recipients the policy should apply to in the Emails From and Emails To sections.

   Secure Messaging only applies to messages from internal to external recipients. Be sure to consider this when selecting senders and recipients in this section.

8. In the Validity section, optionally set:

• • The date range during which the policy should be active. Use the Always On button to activate the policy continuously.
  • Policy Override to force the policy to apply when there are conflicting policies.
  • Source IP Ranges to specify if the policy should only apply when Mimecast receives a connection from the defined IPs.

8. Do not set the Bi-Directional setting, as a Secure Messaging policy is for internal to external messages only.
9. Click Save and Exit to apply the policy.

Next Steps

Once the policy is saved, any message that matches the sender and recipients specified will be delivered via Secure Messaging.