Elevated MMS Failures for 10DLC 501(c)(3) Campaigns

What to do

• Check whether you use Telnyx NORAM. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 21h 35m it lasted.

  Anything that failed between 2026-09-22 22:13 UTC and 2026-09-23 19:48 UTC may need a replay.

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Updates from Telnyx 3

1. investigatingSep 22, 2026, 10:13 PM UTC

   We are investigating an elevated rate of MMS send failures (error 40008) affecting 10DLC senders assigned to 501(c)(3) tax-exempt campaigns. Not all traffic in this segment is affected; we are working to identify the exact scope. SMS 501(c)(3) traffic is not impacted as well as SMS and MMS traffic on normal 10DLC routes.

   provider

2. monitoringSep 23, 2026, 4:15 PM UTC

   Our downstream partner has implemented a fix for an issue causing MMS messages from 10DLC senders on 501(c)(3) tax-exempt campaigns to be falsely rejected with error 40008. Error rates have returned to normal levels since the fix was applied. We are currently monitoring live traffic.

   provider

3. resolvedSep 23, 2026, 7:48 PM UTC

   Our downstream partner's fix for MMS messages from 10DLC senders on 501(c)(3) tax-exempt campaigns being falsely rejected with error 40008 has been confirmed. Error rates have remained at normal levels throughout the monitoring period.

   provider

Corrections

None so far.

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