SparkPost Outage History

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There were 6 SparkPost outages since February 18, 2026 totaling 33h 12m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.sparkpost.com

Minor April 5, 2026

Increased bounce or delay rate for Apple domains

Detected by Pingoru
Apr 05, 2026, 06:27 PM UTC
Resolved
Apr 05, 2026, 07:01 PM UTC
Duration
33m
Affected: SMTP Delivery - USASMTP Delivery - EUROPE
Timeline · 4 updates
  1. investigating Apr 05, 2026, 05:02 PM UTC

    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.

  2. identified Apr 05, 2026, 05:58 PM UTC

    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.

  3. monitoring Apr 05, 2026, 06:27 PM UTC

    Apple has implemented a fix and we are monitoring the results.

  4. resolved Apr 05, 2026, 07:01 PM UTC

    Delivery 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 suppressed during the outage. NOTE: As of Monday April 5th at 9PM EDT the cleanup has been completed. All recipient addresses to Apple or Apple Private Relay domains that were suppressed during Apple's incident window were removed.

Read the full incident report →

Major March 12, 2026

Email delivery in US region affected

Detected by Pingoru
Mar 12, 2026, 06:51 AM UTC
Resolved
Mar 12, 2026, 11:25 AM UTC
Duration
4h 33m
Affected: SMTP Delivery - USA
Timeline · 5 updates
  1. investigating Mar 12, 2026, 06:51 AM UTC

    We are currently investigating issues with delivery of email impacting US region.

  2. monitoring Mar 12, 2026, 07:48 AM UTC

    System is fully recovered and under monitoring.

  3. investigating Mar 12, 2026, 08:00 AM UTC

    Email delivery in US is impacted, experiencing elevated delays.

  4. monitoring Mar 12, 2026, 10:03 AM UTC

    System functionality has been fully restored and all emails are being transmitted correctly without added latencies; we are actively monitoring.

  5. resolved Mar 12, 2026, 11:25 AM UTC

    This incident has been resolved.

Read the full incident report →

Minor March 5, 2026

Outbound message delivery is delayed/slow for some SparkPost customers (US and EU regions)

Detected by Pingoru
Mar 05, 2026, 12:51 AM UTC
Resolved
Mar 05, 2026, 01:24 AM UTC
Duration
32m
Affected: SMTP Delivery - USASMTP Delivery - EUROPE
Timeline · 3 updates
  1. investigating Mar 05, 2026, 12:51 AM UTC

    We are investigating an increase in delivery latency for some outbound messages.

  2. monitoring Mar 05, 2026, 01:00 AM UTC

    We are observing recovery in email delivery performance and are actively monitoring.

  3. resolved Mar 05, 2026, 01:24 AM UTC

    This incident has been resolved.

Read the full incident report →

Minor February 26, 2026

Microsoft Mail Delivery Delays and Temporary Rejections

Detected by Pingoru
Feb 26, 2026, 05:55 PM UTC
Resolved
Feb 27, 2026, 05:38 PM UTC
Duration
23h 42m
Affected: Mailbox Provider Service Interruption
Timeline · 2 updates
  1. monitoring Feb 26, 2026, 05:55 PM UTC

    We are currently seeing elevated temporary rejection rates for email delivered to Outlook.com, Hotmail, and other Microsoft-hosted addresses. Microsoft has acknowledged the issue and is actively investigating. This is a industry-wide issue and not isolated to any specific account. We will continue to monitor and update this page as we receive more information. Next update: When Microsoft posts a resolution or Bird observes delivery rates normalizing

  2. resolved Feb 27, 2026, 05:38 PM UTC

    Microsoft 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 your normal support channels and our team can investigate and escalate with Microsoft.

Read the full incident report →

Major February 24, 2026

Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)

Detected by Pingoru
Feb 24, 2026, 07:07 PM UTC
Resolved
Feb 24, 2026, 07:41 PM UTC
Duration
34m
Affected: Transmissions API - USA
Timeline · 6 updates
  1. investigating Feb 24, 2026, 07:07 PM UTC

    We are experiencing an elevated level of errors and latency on the Transmissions API (injection API) for some SparkPost customers. Please retry any 5xx error. Note: This issue does not impact SparkPost customers hosted in the EU.

  2. investigating Feb 24, 2026, 07:07 PM UTC

    We are continuing to investigate this issue.

  3. investigating Feb 24, 2026, 07:25 PM UTC

    We are continuing to investigate this issue. We still see 5xx errors on mail injections and degradation.

  4. identified Feb 24, 2026, 07:34 PM UTC

    The team has identified the root cause. There is a core networking issue that has impacted sending across the clusters.

  5. monitoring Feb 24, 2026, 07:38 PM UTC

    A fix has been implemented and we are monitoring the results.

  6. resolved Feb 24, 2026, 07:41 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor February 24, 2026

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

Detected by Pingoru
Feb 24, 2026, 03:01 PM UTC
Resolved
Feb 24, 2026, 06:17 PM UTC
Duration
3h 15m
Affected: SMTP Delivery - USA
Timeline · 4 updates
  1. investigating Feb 24, 2026, 03:01 PM UTC

    We are currently investigating this issue. No messages are lost.

  2. identified Feb 24, 2026, 05:19 PM UTC

    The issue has been identified and a fix is being implemented.

  3. monitoring Feb 24, 2026, 05:34 PM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Feb 24, 2026, 06:17 PM UTC

    This incident has been resolved.

Read the full incident report →

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