SparkPost outage, 26 February 2026

Microsoft Mail Delivery Delays and Temporary Rejections

Started
Resolved
27 Feb 2026, 17:38 UTC (after 23 h 42 min)
Impact
Minor
Affected
Mailbox Provider Service Interruption

Last update from SparkPost

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.

27 Feb 2026, 17:38 UTC

Read the full incident on the official SparkPost status page

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This page is the record of one past incident. For the live status, see Is SparkPost down right now? - it reads the official status page every 2 minutes.

Other SparkPost incidents

  1. Increased message delays in US and EU due to DNS resolution errors

  2. Mail delivery delays

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

  4. Health Score and Cohort data is delayed

  5. Elevated hard bounces for Apple private relay recipients (privaterelay.appleid.com)

  6. Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only)

  7. Partial Outage and Delivery Issues in US-West-2 Region

  8. There is a delay effecting some mail sending in EU.

All recorded SparkPost incidents