Auto Response Policies

Document created by user.oxriBaJeN4 Employee on Sep 11, 2015Last modified by user.oxriBaJeN4 Employee on Jun 29, 2017
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Auto Response policies can be used to automatically issue a response for inbound emails to Mimecast from external senders. Administrators can configure the text or HTML to be used, as well as the other variables for the notification.

This feature is only available for customers that use the latest email gateway, and cannot be used for alias addresses.


An auto response policy will apply the Notification options based on the sender and recipient addresses specified. It will not apply to other auto response notifications (e.g. Exchange Out of Office replies) to prevent mail loops. Tracking options can be configured to prevent auto response notifications from being resent after being issued once. This feature does not replace existing Out of Office functionality provided natively with email servers, as it will only apply to inbound emails to Mimecast, and cannot be configured by end users. Additionally auto response notifications will only be issued when Mimecast attempts to deliver the email to the organization's email server. Emails that are Held, Bounced, or Rejected will not generate auto response notifications.


Auto response notifications are sent for messages in the Delivery Queue which have been delayed by Pausing Inbound Delivery. Auto response notifications will not be issued for the following:

  • Mailing list header fields:

    “Precedence: list”“X-Precedence: list”
  • Automatically generated messages with the following headers:

    “Auto-Submitted: auto-generated/auto-replied”“X-MC-System”“X-Autoreply: yes”
    “X-Auto-Response-Suppress”“X-FC-MachineGenerated”“X-Mailer: MediaWiki mailer”
    "X-Autorespond""X-POST-MessageClass: 9; Autoresponder"“X-Facebook-Notify”
    “X-AutoReply-From/X-Mail-Autoreply”“Delivered-To: Autoresponder”“X-Autogenerated”
    “Precedence: auto_reply”“X-Precedence: auto_reply”




Your organization may require an auto response to be generated for specific internal addresses, potentially for one of the reasons listed below:

  • Physical office move, closure or inaccessibility
  • Natural disasters
  • IT infrastructure outages
  • Unmonitored addresses


What You'll Need


  • An Administrator Console logon with access to the Administration | Gateway | Policies menu item.
  • A previously configured Auto Response definition.


Creating a Policy


To create a policy, follow the instructions in the Creating / Changing a Policy article, but using the following options:


Policy NarrativeProvide a description for the Policy to allow you to easily identify it in the future.
Admin Auto Response Configuration

Select the required Auto Response definition for the policy from the drop down list.


Definition Required?


Yes. See the Configuring an Auto Response Definition page for full details.

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