This incident has been resolved.

A fix has been implemented and we are monitoring the results.

New incident: Investigating

We have been informed by one of our US suppliers about an issue impacting the following carrier:
AT&T.

As a result of this issue, inbound and outbound messages and delivery receipts may be impacted.

The carrier is aware of this issue and investigating the root cause. We will issue an update as soon as more information becomes available.