Update: 4pm 6/6/2017 UTC
The temporary send delay is now resolved and all emails should be processing as normal. IF you are experience any residual problems, please let our support team know. We apologize for any issues this short disruption may have caused.
Impact: We have begin receiving reports of delays with US emails going out. Our operations team is working to resolve urgently and we will post back here as more updates are available.
Reported: 3pm 6/6/2017 UTC