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SparkPost

Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)

Degraded Lasted 4h 5m · started · SparkPost's page

Level
confirmed
Worst impact
Degraded
Components
SMTP Delivery - USA
Regions
eu, us

What to do

  • Check whether you use SparkPost SMTP Delivery - USA 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 4h 5m it lasted.

    Anything that failed between 2025-05-18 14:58 UTC and 2025-05-18 19:03 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. investigating

    We are investigating an increase in delivery latency for a small percentage of outbound messages. (NOTE: This does not impact our customers hosted in the EU.)

    provider

  2. monitoring

    Latencies are now back to normal. We will continue monitoring, but do not expect any further deviation.

    provider

  3. resolved

    Latencies have remained normal since the last update. We are confident the situation is fully resolved.

    provider

Reports count in aggregate; nothing about you is shown.

Corrections

None so far.

Something wrong on this page? Report an error or send us a note. Every fix is listed here.

Questions about DWN-61d6f52a56

Is SparkPost still down?

No, this incident was resolved 2025-05-18 19:03 UTC. For SparkPost's live state, see https://down.guide/sparkpost.

How long did it last?

4h 5m, from 2025-05-18 14:58 UTC to 2025-05-18 19:03 UTC, by the times SparkPost posted.

What was affected?

SparkPost named SMTP Delivery - USA in eu, us.

What caused it?

SparkPost hasn't published a root cause. If it does, it shows here.

Where does this come from?

SparkPost's official status page, https://status.sparkpost.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.