Configuring a Secure Messaging Definition

Document created by user.oxriBaJeN4 Employee on Sep 7, 2015Last modified by user.oxriBaJeN4 Employee on Apr 2, 2019
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A default secure messaging definition is automatically created when your Mimecast account is created. However you cannot change it's configuration. This guide describes how to configure your own secure messaging definitions.


Applies To...


  • Administrators responsible for configuring secure messaging definitions, for use when sending messages securely in Mimecast end user applications.
Secure Messaging-Lite doesn't allow the creation of secure messaging definitions. For more details see the Secure Messaging - Lite page.



Secure messaging definitions are grouped in folders. It is these folders that are used to publish the definitions to end users. This is an important consideration when creating more than one definition, as the folder location will determine who has access to each.


To create a secure messaging definition:

  1. Log in to the Administration Console.
  2. Click on the Administration toolbar button. A menu drop down is displayed.
  3. Click on the Gateway | Policies menu item.
  4. Click on the Definitions drop down.
  5. Select the Secure Messaging menu item.
  6. Either:
    • Select the Folder where the definition is to be created, or already exists.
      A definition cannot be created in the Root folder.
    • Create a Folder where the definition is to be created. See the Administration Console: Managing Folders page for full details.
  7. Either
    • Click on the New Secure Messaging Definition button to create a definition.
    • Click on the Definition to be changed.
  8. Complete the Definition's Properties as follows:

    Field / OptionDescription
    DescriptionThis is used to identify the definition. It is good practice to ensure this accurately describes to settings below (e.g. Allow Print, 7 Day Exp, No Receipt).
    Allow External Recipient to PrintIf selected, the recipient of the secure message can print it.
    Allow External Recipient to ReplyIf selected, the recipient of the secure message can reply to the sender.
    If the sender sent the message to multiple recipients, they cannot use the Reply All functionality unless the "Allow External Recipient to Reply All" option is also selected.
    Allow External Recipient to Reply AllIf selected, the recipient of the secure message can reply to all the recipients.
    Expire Secure Messages for External Recipients AfterSet the expiration date of any secure message sent to an external recipient using this definition.
    If the secure message using this definition is sent to internal recipients, they can see the message after the expiration date.

    If the "Never Expire" option is selected, this is limited to the maximum retention period for your account.
    Allow Sender to Extend Message Expiration by a Maximum ofSet the time period during which the sender can extend the secure message's expiration date.
    Send Read ReceiptIf selected, the sender receives a notification when the recipient views the secure message.
  9. Click on the Save and Exit button.


The definition is ready to be applied to a Secure Messaging Policy or Secure Messaging Bypass Policy


See Also...


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