Resolved after 17 hours 4 minutes, affecting MMS Messaging (MM4) and REST APIs - HTTP MMS Messaging, on February 16, 2026.
A subset of outbound MMS messages to AT&T subscribers were intermittently unable to be delivered during the peak messaging traffic hours of 16:00 - 20:00 UTC on February 16, 17 and 18. Bandwidth has concluded its investigation of this issue and details can be found in the following Incident Report: [20260216 | Outbound MMS to AT&T](https://www.bandwidth.com/support/en/articles/14006028-20260216-outbound-mms-to-at-t) We are grateful you have entrusted Bandwidth as your communication partner and we are sorry if this issue resulted in any disruption to your services.
Affected components
Update timeline
- investigating Feb 16, 2026, 08:06 PM UTC
Bandwidth teams are investigating an incident with outbound 10DLC MMS messages towards the AT&T network. These messages are failing to deliver as expected.
- monitoring Feb 16, 2026, 09:40 PM UTC
Teams are observing expected messaging behavior. We will continue to monitor for prolonged stability.
- resolved Feb 17, 2026, 01:10 PM UTC
This incident has been resolved.
- postmortem Mar 09, 2026, 12:34 PM UTC
A subset of outbound MMS messages to AT&T subscribers were intermittently unable to be delivered during the peak messaging traffic hours of 16:00 - 20:00 UTC on February 16, 17 and 18. Bandwidth has concluded its investigation of this issue and details can be found in the following Incident Report: [20260216 | Outbound MMS to AT&T](https://www.bandwidth.com/support/en/articles/14006028-20260216-outbound-mms-to-at-t) We are grateful you have entrusted Bandwidth as your communication partner and we are sorry if this issue resulted in any disruption to your services.
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