Feature: Email Send delivery
Impact: Some US customers are being affected by a delivery issue that can affect any emails sent. Our development and deliverability teams has been alerted to this issue and investigation is underway.
Update: Root Cause - Our MTA service reported too many requests in a specific time frame and once the amount went down the deliverability was restored
Announced: 09:00 pm UTC : 12/15/2017
Resolved: 11:00 pm UTC: 12/19/2017