MFS_ALERT How is this email generated, how do I stop it?

In 12.1.3 the email below is being generated whenever a task is assigned (manually or via scheduler) to a field service engineer.  I don't need this, but I don't know how to identify the workflow to stop it.
Ideas?

Oracle Workflow Notification
Time Zone (GMT -06:00/-05:00) Central Time

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Response Template for
NID[5582574/290078246786565968541887454597973951039@WFMAIL]

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    Download Status: ""
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Notification Details:

MFS_ALERT_DETAILS:NOTIFICATION_ID=5582574:TASK_NUMBER=188466:TASK_NAME=Test again, please:INCIDENT_NUMBER=1094700:INCIDENT_SUMMARY=Fix it,