- Level
- confirmed
- Worst impact
- Degraded
- Components
- SMTP Delivery - USA, SMTP Delivery - EUROPE
- Regions
- eu, us
- Down Index
- 31of 100
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 12d 5h it lasted.
Anything that failed between 2026-01-15 11:06 UTC and 2026-01-27 16:33 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 11
- investigating
We are currently investing reported delays when sending emails towards Microsoft email domains
provider
- investigating
Impact is currently scoped to EU region only. Investigation ongoing; tickets raised to Microsoft to further investigation.
provider
- investigating
We continue to work with Microsoft on full mitigation. They are currently experiencing infrastructure issues that is causing them to incorrectly block legitimate traffic from multiple Bird IP ranges. Our sending infrastructure and email traffic are operating normally. All other mailbox providers are receiving mail without issue. Microsoft is aware of the issue and is actively investigating. We are in contact with their team and monitoring for resolution. We expect this to be resolved once Microsoft completes their fix. Messages will retry automatically - no action needed from you
provider
- investigating
Microsoft continues to investigate the issue. We are actively in contact with their team.
provider
- identified
We continue to work with Microsoft on these delays. We are in active contact with their delivery team and working towards full resolution.
provider
- identified
We have started to receive reports from Microsoft that they are implementing mitigations within their environment. We continue to monitor and coordinate with them for full resolution.
provider
- identified
We continue to see some delays at Microsoft domains and are working with Microsoft to remediate. At this time, Microsoft is aware and continues to investigate.
provider
- monitoring
We have seen stabilization, but are still seeing Microsoft delays in rare cases. Our team is mitigating with Microsoft as those occur. We are going to keep the status page in Monitoring state through the weekend as we continue to monitor for a full recovery at Microsoft.
provider
- monitoring
We continue to see improvement with Microsoft delivery, though isolated cases of delays persist. Microsoft's mitigations are largely effective, but we're still working with their team to address edge cases as they arise. We will continue to maintain heightened monitoring through the week to ensure complete stabilization. No action is required from senders - any affected messages will continue to retry automatically.
provider
- monitoring
We continue to receive reports of outages at Microsoft, as well as delayed mail sending to Microsoft and their related properties. If you are experiencing delays or IP blocks in sending to Microsoft related properties, please open a ticket with your Technical Account Manager or email support@bird.com (or your dedicated support channel if applicable). For detals around the Microsoft 365 please reference Microsoft's Status Page at: https://status.cloud.microsoft/m365
provider
- resolved
We continue to receive sporadic reports of outages at Microsoft, as well as delayed mail sending to Microsoft and their related properties. But have seen recovery for most senders. If you are experiencing delays or IP blocks in sending to Microsoft related properties, please open a ticket with your Technical Account Manager or email support@bird.com (or your dedicated support channel if applicable).
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-d113eda992
Is SparkPost still down?
No, this incident was resolved 2026-01-27 16:33 UTC. For SparkPost's live state, see https://down.guide/sparkpost.
How long did it last?
12d 5h, from 2026-01-15 11:06 UTC to 2026-01-27 16:33 UTC, by the times SparkPost posted.
What was affected?
SparkPost named SMTP Delivery - USA, SMTP Delivery - EUROPE 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.