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91.4%of 58 verified observed days had no reported provider issue
90-Day Trend
Dashed calendar markers below identify legacy observations whose source-at-observation was not recorded.
Monthly Status Summary
Month
Issue-free days
Days Tracked
Days with issues
September 2026
93.3%
30
2
This percentage summarizes normalized provider-status observations by calendar day. It is not duration-based, component-weighted, or contractual uptime. See the methodology and limitations.
Recorded Daily Status (Last 91 Days)
Jul 23Today
Legacy observation Operational Degraded Partial Outage Major Outage Maintenance No Data
Incident History
October 2026
Increased message delays in US and EU due to DNS resolution errors
A fix has been implemented and we are monitoring the results.
identified
We are continuing to work on a fix for this issue.
identified
We are continuing to rollout the new root signing keys from ICANN. We continue to see recovery across our global clusters.
identified
We are investigating an increase in delayed (deferred) messages in both our US and EU regions, beginning at approximately 14:40 UTC on October 11. A subset of our internal DNS resolvers are intermittently failing to resolve recipient domains, causing some delivery attempts to be temporarily deferred.
Affected messages are not being dropped or bounced. Retries are succeeding as they are routed to healthy resolvers, so impacted messages are being delivered with additional latency. Customers may observe an elevated number of delay events in webhooks, event logs, and reporting during this time.
We have identified the cause as a DNSSEC validation issue on a portion of our resolver fleet related to a scheduled update of the internet's root DNS signing key, and are applying a fix. No action is required from customers. We will provide an update within 60 minutes or as soon as we have more information.
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.
investigating
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.
September 2026
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
SparkPost Application - USASparkPost Application - EUROPE
monitoring
Data is reprocessed and loads are completing. Full data recovery expected in the next 30 minutes.
identified
We know what has caused the data delay and are working to get the data posted.
investigating
Health score and Cohort data is delayed.
Legacy Incident Archive
8 archived records restored. These records predate source-at-observation attestation. They are shown as historical ServiceAlert records only and do not establish a provider-reported incident, resolution, duration, or current active state.
August 2026
Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only)
minorSource not attested
Last archived state: resolved
View archived record details
SMTP Delivery - EUROPE
monitoring
A fix has been implemented and we are monitoring the results.
investigating
We are investigating an increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the US.)
July 2026
Partial Outage and Delivery Issues in US-West-2 Region
criticalSource not attested
Last archived state: resolved
View archived record details
monitoring
We have implemented additional tuning to handle the significant influx of mail due to the AWS network outage and we are seeing improvement in delivery rates
We are seeing significant recovery and expect most mail to be fully delivered in the next 30-35 minutes. Estimated time for full recovery is 80-90 minutes.
We are continuing to look for additional optimizations and monitor the issue.
monitoring
We are still working through the queued messages.
We are continuing to monitor the issue and continuing to accept emails.
monitoring
We are starting to deliver mails in our US West region. We are working through the queued messages.
We are continuing to monitor the issue and continuing to accept emails.
identified
Outbound email delivery is blocked for our US West region. We working with our vendor resolve the issue.
We are continuing to accept emails and queue them internally. We will deliver the messages as soon as the issue is resolved.
investigating
We are investigating delivery issues caused by an ongoing AWS US West 2 region outage.
Customers may experience delays while we assess the impact to our service. We are actively monitoring the situation and will provide updates as more information becomes available.
June 2026
There is a delay effecting some mail sending in EU.
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
There was a combination of events that caused a short period of slowdown. That slowdown has already recovered and we are monitoring to ensure we do not see it again.
investigating
We are investigating the delay and the impact. We will post once we know more.
May 2026
Issue with updating payment information
Source not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been implemented and we are monitoring the results.
identified
We’re currently investigating an issue that prevented some customers from updating their payment details.
The root cause has been identified, and a fix is being implemented.
Elevated 5xx Suppression List API error rates and latency for some SparkPost customers (US hosted only)
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been implemented and we are monitoring the results.
identified
We are experiencing an elevated level of errors and latency on the Suppression List API for some SparkPost customers. Please retry any 5xx error.
Note: This issue does not impact SparkPost customers hosted in the EU.
Delayed delivery for some messages in EU
Source not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been implemented and we are monitoring the results.
identified
The issue has been identified and a fix is being implemented.
investigating
We are looking into why some messages are seeing delayed delivery.
Intermittent email injection failures affecting a small subset of customers in Europe
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been implemented and we are monitoring the results.
investigating
We are currently investigating this issue.
April 2026
Increased bounce or delay rate for Apple domains
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been implemented and we are monitoring the results.
identified
The issue was caused by an Apple iCloud Mail outage (https://www.apple.com/support/systemstatus/), which Apple has since marked as resolved. Bounce rates and delivery delays to Apple domains have returned to normal levels. We are currently reviewing our suppression lists to identify and remove any recipients that may have been incorrectly added during the incident.
investigating
We are currently investigating reports of delayed or failed email deliveries to Apple-hosted domains. Messages to non-Apple domains are unaffected. We will provide updates as more information becomes available.
