Email delivery issues

What to do

• Check whether you use Braze Email. 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 2h 55m it lasted.

  Anything that failed between 2026-01-23 00:47 UTC and 2026-01-23 03:42 UTC may need a replay.

• Subscribe to Braze's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=braze works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Braze 4

1. investigatingJan 23, 2026, 12:47 AM UTC

   Braze Engineers have identified elevated email bounce rates for customers sending email via SparkPost (Bird), starting around 17:35 ET. We are working with SparkPost Engineering who are aware and investigating the issue. We'll update in 30 minutes or when we have an update from Sparkpost.

   provider

2. investigatingJan 23, 2026, 2:00 AM UTC

   Braze and Sparkpost engineers continue to investigate this issue. While we have not fully identified the root cause, Sparkpost is reverting a code deployment from this afternoon that we believe could be correlated. Our next update will come in an hour, or when the revert is complete.

   provider

3. monitoringJan 23, 2026, 2:57 AM UTC

   SparkPost's revert successfully resolved this issue, and we have seen bounce rates return to normal levels, and no instances of the specific error code as of 9:42 PM ET. Our engineering teams will continue to monitor the situation to ensure the issue does not recur.

   provider

4. resolvedJan 23, 2026, 3:42 AM UTC

   We have not seen any instances of the specific error code in an hour, since 9:42 PM ET. This incident is considered resolved.

   provider

Corrections

None so far.

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