SparkPost Outage History

41 incidents recorded over the last 365 days, 37 of them resolved. Durations are measured from when PulsAPI first saw the problem to when it cleared, which is usually longer than the vendor's own figure.

Live SparkPost status99.47% uptime history

Every Recorded SparkPost Incident

SparkPost incidents, newest first, with date, duration and status.
DateIncidentDurationStatus
Aug 19, 2026Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only)This incident has been resolved.1h 5mResolved
Jul 24, 2026Partial Outage and Delivery Issues in US-West-2 RegionThis incident has been resolved.7h 29mResolved
Jun 29, 2026There is a delay effecting some mail sending in EU.This incident has been resolved.48 minResolved
May 12, 2026Issue with updating payment informationThis incident has been resolved.49 minResolved
May 11, 2026Elevated 5xx Suppression List API error rates and latency for some SparkPost customers (US hosted only)This incident has been resolved.1h 7mResolved
May 9, 2026Delayed delivery for some messages in EUThis incident has been resolved.38 minResolved
May 7, 2026Intermittent email injection failures affecting a small subset of customers in EuropeThis incident has been resolved.26h 0mResolved
Apr 5, 2026Increased bounce or delay rate for Apple domainsDelivery rates to Apple domains have returned to normal with no further elevated delays or bounces. We will perform any necessary post-incident cleanup of suppression lists to ensure no recipients were incorrectly…1h 58mResolved
Mar 16, 2026Router Maintenance in EU Data CenterThe scheduled maintenance has been completed.4h 0mScheduled
Mar 12, 2026Email delivery in US region affectedThis incident has been resolved.4h 33mResolved
Mar 5, 2026Outbound message delivery is delayed/slow for some SparkPost customers (US and EU regions)This incident has been resolved.32 minResolved
Feb 26, 2026Microsoft Mail Delivery Delays and Temporary RejectionsMicrosoft has confirmed that they made additional changes the night of Thursday, Feb 26th that should have remediated most IP rate limiting and rejection issues. If you are still seeing impacts, please reach out via…23h 42mResolved
Feb 24, 2026Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)This incident has been resolved.34 minResolved
Feb 24, 2026Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.3h 15mResolved
Feb 20, 2026Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.26 minResolved
Feb 18, 2026Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.2h 15mResolved
Jan 27, 2026SSO Login Failures Due to reCAPTCHA Configuration IssueThis incident has been resolved.211h 42mResolved
Jan 15, 2026Delays in sending emails to Microsoft domainsWe 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…293h 26mResolved
Jan 14, 2026Delays in sending emails to yahoo.com domain in EU and US regionsWe've experienced processing delays of up to 1h30min for sending emails to yahoo.com domain in the EU and US regions.-207 minResolved
Dec 11, 2025Delay in event processing.This incident has been resolved.3h 51mResolved
Dec 11, 2025Longer than expected delaysThis incident has been resolved.1h 59mResolved
Dec 10, 2025Data processing delaysThis incident has been resolved.3h 10mResolved
Dec 10, 2025Increased error rates and latency from our APIsThis incident has been resolved.2h 29mResolved
Dec 8, 2025Data Process is delayed for Sparkpost US - EUThis incident has been resolved.3h 8mResolved
Dec 5, 2025Data processing delays for SparkPost customers - US and EU regionsThe incident has been resolved.3h 6mResolved
Nov 28, 2025Yahoo Mail Sending DelaysThis incident has been resolved.37 minResolved
Nov 27, 2025Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)We have seen fully recovery from this delay event. A postmortem will be posted shortly detailing the root cause and steps we have taken to prevent a reoccurrence.1h 1mResolved
Nov 27, 2025Emergency SparkPost Templates API Database MaintenanceThe scheduled maintenance has been completed.2h 0mScheduled
Nov 27, 2025High response times on the APIThis incident was resolved.1h 37mResolved
Nov 25, 2025Scheduled Database Maintenance US - Prep for Black Friday & Cyber MondayThe scheduled maintenance has been completed.1h 0mScheduled
Nov 24, 2025Scheduled Database Maintenance EU - Prep for Black Friday & Cyber MondayThe scheduled maintenance has been completed.1h 0mScheduled
Nov 21, 2025Intermittent email api failures impacting EU customersThis incident has been resolved.1h 22mResolved
Nov 20, 2025Webhook delays for some SparkPost customers (US hosted only)This issue has been resolved. We apologize for any inconvenience it may have cause.2h 27mResolved
Nov 11, 2025SMTP message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident impacted a limited batch of messages injected via SMTP API. We have quarantined the impacted the node and working on delivering the messages and isolating the root cause. The SMTP API is full operational1h 35mResolved
Nov 10, 2025Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.1h 3mResolved
Nov 4, 2025Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.3 minResolved
Oct 28, 2025Outbound message delivery is slightly delayed/slow for some SparkPost customers (US hosted only)This incident has been resolved.1h 53mResolved
Oct 20, 2025Transmissions API - Elevated error rate in US regionThis incident has been resolved.1h 13mResolved
Oct 13, 2025Captcha error for login with passwordThis incident has been resolved.3h 14mResolved
Sep 24, 2025Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only)This incident has been resolved.1h 46mResolved
Sep 12, 2025Data processing delaysThis incident has been resolved.6h 41mResolved

How to Read This SparkPost Incident Log

Each row is an incident PulsAPI observed, not a summary written afterwards. The duration is wall-clock time between the first failing check and the first clean one, so it includes the window before SparkPost acknowledged anything. Vendor post-mortems typically measure from acknowledgement, which is why their numbers are usually shorter.

Incidents still open have no duration yet and are listed as ongoing rather than being given a running total. The archive covers the last 365 days; anything older has aged out of the window rather than never having happened.

The longest single SparkPost outage in this window ran 12d 5h, against a mean recovery of 15h 46m. If you depend on SparkPost in a customer-facing path, the longest figure is the one to design around. The mean is what happens on a normal bad day; the maximum is what happens on the worst one.