Mail delivery delays

What to do

• Check whether you use SparkPost SMTP Delivery - USA, SMTP Delivery - EUROPE in eu, us. 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 31m it lasted.

  Anything that failed between 2026-10-01 17:05 UTC and 2026-10-01 17:36 UTC may need a replay.

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

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

Updates from SparkPost 3

1. investigatingOct 1, 2026, 5:05 PM UTC

   Some email deliveries are being delayed. The delays come and go, and queued messages are being delivered once each one clears. Our team is investigating the cause and working on a fix. We'll post an update here as soon as we know more. We apologize for the disruption.

   provider

2. monitoringOct 1, 2026, 5:16 PM UTC

   We've made changes to address the intermittent delivery delays. Since then, email has been delivered without delay, including during peak sending periods that previously caused the slowdowns. We're watching closely to confirm the issue is fully resolved and will post an update here. Thank you for your patience.

   provider

3. resolvedOct 1, 2026, 5:36 PM UTC

   This issue has been resolved. Since our changes went in, we've seen no further delivery delays, including through peak sending periods. Email is being delivered normally. We apologize for the disruption and thank you for your patience.

   provider

Corrections

None so far.

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