Symptoms
Email event gets stuck in a loop.
Diagnoses
1. Workflow to start on Item Add and Update
2. An item is added. Triggers a workflow.
3. Workflow creates a new item and updates the same item. Triggers a workflow instance.
4. Loops forever by sending remote event receiver calls to Appit.
5. Appit server gets flooded and brings everything to a halt.
Resolution
Redesign the workflow to remove the looping activities. A Feature Request was also submitted.