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Mimecast Source


The Mimecast Source supports collecting SIEM, DLP, Audit, and Hold Message List data from the Mimecast API. It securely stores the required authentication, scheduling, and state tracking information.

The Mimecast Source leverages the following:


This Source is not available in the Fed deployment.


A Mimecast Source tracks errors, reports its health, and start-up progress. You’re informed, in real-time, if the Source is having trouble connecting, if there's an error requiring user action, or if it is healthy and collecting by utilizing Health Events.

A Mimecast Source goes through the following states when created:

  1. Pending. Once the Source is submitted, it is validated, stored, and placed in a Pending state.
  2. Started. A collection task is created on the Hosted Collector.
  3. Initialized. The task configuration is complete in Sumo Logic.
  4. Authenticated. The Source successfully authenticated with Mimecast.
  5. Collecting. The Source is actively collecting data from Mimecast.

If the Source has any issues during any one of these states, it is placed in an Error state.

When you delete the Source, it is placed in a Stopping state. When it has successfully stopped, it is deleted from your Hosted Collector.

On the Collection page, the Health and Status for Sources is displayed. Use Health Events to investigate issues with collection.

error mimecast.png

Hover your mouse over the status icon to view a tooltip with details on the detected issue.

health error generic.png


The user account associated with your Mimecast credentials needs to have basic administrator access. In the Enhanced Logging section of the Administration > Account > Account Settings menu in the Administration Console, at least one of the fields should be enabled for email logging for at least one inbound, outbound, and internal emails.

See these guidelines to create the necessary credentials you'll need to authenticate the Mimecast Source, which includes an Application Key, Secret Key, and Access Key.


Consider the Authentication Profile TTL when configuring access. If your credentials expire you'll receive a 418 Error message from the Health Events of your Source, in which case you'll need to provide new credentials. Details on the recommended configuration, including setting a non-expiring key is found in the guidelines.

Create a Mimecast Source

When you create a Mimecast Source, you add it to a Hosted Collector. Before creating the Source, identify the Hosted Collector you want to use or create a new Hosted Collector. For instructions, see Configure a Hosted Collector.

To configure a Mimecast Source:

  1. In Sumo Logic, select Manage Data > Collection > Collection

  2. On the Collectors page, click Add Source next to a Hosted Collector.

  3. Select Mimecast.

    Mimecast ico.png

  4. Enter a Name for the Source. The description is optional.

    mimecast add apis input.png

  5. (Optional) For Source Category, enter any string to tag the output collected from the Source. Category metadata is stored in a searchable field called _sourceCategory.

  6. Forward to SIEM. Check the checkbox to forward your data to Cloud SIEM Enterprise. When configured with the Forward to SIEM option the following metadata fields are set:

    • _siemVendor: Mimecast
    • _siemProduct: Mimecast
    • _siemFormat: JSON
    • _siemEventID: The SIEM event ID is populated by the suffix of the file name, which references the log type. This includes values such as:
      • receipt
      • process
      • delivery
      • jrnl
      • ttp

    The DLP event id is dlp.

  7. (Optional) Fields. Click the +Add Field link to define the fields you want to associate, each field needs a name (key) and value.

    • green check circle.png A green circle with a check mark is shown when the field exists in the Fields table schema.
    • orange exclamation point.png An orange triangle with an exclamation point is shown when the field doesn't exist in the Fields table schema. In this case, an option to automatically add the nonexistent fields to the Fields table schema is provided. If a field is sent to Sumo that does not exist in the Fields schema it is ignored, known as dropped. 
  8. Base URL. The base URL parameter depends on your global region. See this Mimecast document for guidance on which base URL to use.

  9. Provide the Application ID, Access Key, and Secret Key to authenticate requests. See these guidelines to create the necessary authentication requirements.

  10. Supported APIs to collect. Select one or more of the available APIs: SIEM, DLP, Audit Events, and Hold Message List.

    mimecast additional apis option.png

  11. When you are finished configuring the Source, click Submit.

Error types

When Sumo Logic detects an issue it is tracked by Health Events. The following table shows the three possible error types, the reason the error would occur, if the Source attempts to retry, and the name of the event log in the Health Event Index.

TypeReasonRetriesRetry BehaviorHealth Event Name
ThirdPartyConfigNormally due to an invalid configuration. You'll need to review your Source configuration and make an update.No retries are attempted until the Source is updated.Not applicableThirdPartyConfigError
ThirdPartyGenericNormally due to an error communicating with the third party service APIs.YesThe Source will retry for up to 90 minutes, after which it quits.ThirdPartyGenericError
FirstPartyGenericNormally due to an error communicating with the internal Sumo Logic APIs.YesThe Source will retry for up to 90 minutes, after which it quits.FirstPartyGenericError

Restarting your Source

If your Source encounters ThirdPartyConfig errors, you can restart it from either the Sumo Logic UI or Sumo Logic API.


To restart your source in the Sumo Logic platform, follow the steps below:

  1. Open the Collection page, and go to Manage Data > Collection > Collection.
  2. Select the source and click the information icon on the right side of the row.
  3. The API usage information popup is displayed. Click the Restart Source button on the bottom left.
  4. Click Confirm to send the restart request.
  5. The bottom left of the platform will provide a notification informing you the request was successful.


To restart your source using the Sumo Management API, follow the instructions below:

  • Method: POST
  • Example endpoint:{collector_id}/sources/{source_id}/action/restart

Sumo Logic endpoints like are different in deployments outside us1. For example, an API endpoint in Europe would begin A service endpoint in us2 (Western U.S.) would begin For more information, see Sumo Logic Endpoints.

JSON configuration

Sources can be configured using UTF-8 encoded JSON files with the Collector Management API. See how to use JSON to configure Sources for details. 

configJSON ObjectYesContains the configuration parameters for the Source. 
schemaRefJSON ObjectYesUse {"type":"Mimecast"} for a Mimecast Source.not modifiable
sourceTypeStringYesUse Universal for a Mimecast Source.not modifiable

The following table shows the config parameters for a Mimecast Source.

nameStringYesType a desired name of the Source. The name must be unique per Collector. This value is assigned to the metadata field _source.modifiable
descriptionStringNonullType a description of the Source.modifiable
categoryStringNonullType a category of the source. This value is assigned to the metadata field _sourceCategory. See best practices for details.modifiable
fieldsJSON ObjectNoJSON map of key-value fields (metadata) to apply to the Collector or Source. Use the boolean field _siemForward to enable forwarding to SIEM.modifiable
domainStringYesThe base URL parameter depends on your global region. modifiable
application_keyStringYesThe Mimecast key you want to use to authenticate collection requests. modifiable
application_idBooleanYeshe Mimecast application ID you want to use to authenticate collection requests.modifiable
access_keyStringYesThe Mimecast access key you want to use to authenticate collection requests.modifiable
secret_keyStringYesThe Mimecast secret key you want to use to authenticate collection requests.modifiable
supported_apisArray of stringsYesefine one or more of the available APIs to collect: SIEM, DLP, Audit Events, and Hold Message List. For example, for all you'd use: ["SIEM","DLP","Audit Events","Hold Message List"]modifiable

Mimecast Source JSON example:

"description":"East field",
"supported_apis":["SIEM","DLP","Audit Events","Hold Message List"]
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