# SparkPost incident history - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-5400ddae5b) (Degraded; lasted 22h 2m; started 2026-10-30 19:21 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-631c9e61e5) (Degraded; lasted 1h 1m; started 2026-10-28 19:37 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Increased message delays in US and EU due to DNS resolution errors](https://down.guide/sparkpost/DWN-6823fe6f7b) (Degraded; lasted 3h 6m; started 2026-10-11 17:51 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Mail delivery delays](https://down.guide/sparkpost/DWN-9ced648e50) (Degraded; lasted 31m; started 2026-10-01 17:05 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-7dd36be20e) (Degraded; lasted 54m; started 2026-09-17 09:06 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Health Score and Cohort data is delayed](https://down.guide/sparkpost/DWN-5e214c4732) (Degraded; lasted 2h 27m; started 2026-09-14 14:19 UTC; SparkPost Application - USA, SparkPost Application - EUROPE; eu, us) - **SparkPost**: [Elevated hard bounces for Apple private relay recipients (privaterelay.appleid.com)](https://down.guide/sparkpost/DWN-01194383f4) (Degraded; lasted 4h 54m; started 2026-08-27 18:03 UTC; Mailbox Provider Service Interruption) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only)](https://down.guide/sparkpost/DWN-63af012814) (Degraded; lasted 1h 6m; started 2026-08-19 18:52 UTC; SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Partial Outage and Delivery Issues in US-West-2 Region](https://down.guide/sparkpost/DWN-27c258560b) (Major outage; lasted 7h 30m; started 2026-07-24 11:14 UTC; Transmissions API - USA, SMTP API - USA, SMTP Delivery - USA; us, us-west-2) - **SparkPost**: [There is a delay effecting some mail sending in EU.](https://down.guide/sparkpost/DWN-479d5213f2) (Degraded; lasted 48m; started 2026-06-29 15:58 UTC; SMTP Delivery - EUROPE, SMTP API - EUROPE, Transmissions API - EUROPE; eu) - **SparkPost**: [Issue with updating payment information](https://down.guide/sparkpost/DWN-bcf04f339e) (Degraded; lasted 50m; started 2026-05-12 12:48 UTC) - **SparkPost**: [Elevated 5xx Suppression List API error rates and latency for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-f37686ce6d) (Degraded; lasted 1h 7m; started 2026-05-11 18:55 UTC; Suppression List API - USA; eu, us) - **SparkPost**: [Delayed delivery for some messages in EU](https://down.guide/sparkpost/DWN-62feab523c) (Degraded; lasted 38m; started 2026-05-09 21:39 UTC; SMTP API - EUROPE; eu) - **SparkPost**: [Intermittent email injection failures affecting a small subset of customers in Europe](https://down.guide/sparkpost/DWN-a6b7066a4f) (Degraded; lasted 1d 2h; started 2026-05-07 09:31 UTC; SMTP API - EUROPE; eu) - **SparkPost**: [Increased bounce or delay rate for Apple domains](https://down.guide/sparkpost/DWN-e20efd6fbb) (Degraded; lasted 34m; started 2026-04-05 18:27 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Email delivery in US region affected](https://down.guide/sparkpost/DWN-f05b384fa1) (Partial outage; lasted 4h 34m; started 2026-03-12 06:51 UTC; SMTP Delivery - USA; us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US and EU regions)](https://down.guide/sparkpost/DWN-5ed4cda15b) (Degraded; lasted 33m; started 2026-03-05 00:51 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Microsoft Mail Delivery Delays and Temporary Rejections](https://down.guide/sparkpost/DWN-add2569d9e) (Degraded; lasted 23h 43m; started 2026-02-26 17:55 UTC; Mailbox Provider Service Interruption) - **SparkPost**: [Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-fa2edf189e) (Partial outage; lasted 34m; started 2026-02-24 19:07 UTC; Transmissions API - USA; eu, us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-1747998f55) (Degraded; lasted 3h 15m; started 2026-02-24 15:01 UTC; SMTP Delivery - USA; us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-277a168907) (Degraded; lasted 27m; started 2026-02-20 16:06 UTC; SMTP Delivery - USA; us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-44eef82d1b) (Degraded; lasted 2h 16m; started 2026-02-18 14:51 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [SSO Login Failures Due to reCAPTCHA Configuration Issue](https://down.guide/sparkpost/DWN-ca9ee01367) (Degraded; lasted 8d 19h; started 2026-01-27 16:39 UTC; SparkPost Application - USA; us) - **SparkPost**: [Delays in sending emails to Microsoft domains](https://down.guide/sparkpost/DWN-d113eda992) (Degraded; lasted 12d 5h; started 2026-01-15 11:06 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Delays in sending emails to yahoo.com domain in EU and US regions](https://down.guide/sparkpost/DWN-1fe576f51f) (Degraded; lasted 0m; started 2026-01-14 16:27 UTC; eu, us) - **SparkPost**: [Delay in event processing.](https://down.guide/sparkpost/DWN-431227ebf6) (Degraded; lasted 3h 52m; started 2025-12-11 18:36 UTC; Metrics API - USA, Events API - USA, SparkPost Application - USA +1; us) - **SparkPost**: [Longer than expected delays](https://down.guide/sparkpost/DWN-7d4ffb92ae) (Degraded; lasted 2h; started 2025-12-11 16:34 UTC; SMTP Delivery - USA, SMTP Delivery - EUROPE; eu, us) - **SparkPost**: [Data processing delays](https://down.guide/sparkpost/DWN-cd87de50fa) (Degraded; lasted 3h 11m; started 2025-12-10 21:22 UTC; Metrics API - USA, Events API - USA, SparkPost Application - USA +5; eu, us) - **SparkPost**: [Increased error rates and latency from our APIs](https://down.guide/sparkpost/DWN-5f1460e992) (Degraded; lasted 2h 29m; started 2025-12-10 03:40 UTC; Metrics API - USA, Transmissions API - USA, Events API - USA +6; us) - **SparkPost**: [Data Process is delayed for Sparkpost US - EU](https://down.guide/sparkpost/DWN-79e0829ea9) (Degraded; lasted 3h 8m; started 2025-12-08 02:24 UTC; Metrics API - USA, Events API - USA, SparkPost Application - USA +3; eu, us) - **SparkPost**: [Data processing delays for SparkPost customers - US and EU regions](https://down.guide/sparkpost/DWN-83bd257e26) (Degraded; lasted 3h 7m; started 2025-12-05 19:16 UTC; Metrics API - USA, SparkPost Application - USA, SparkPost Application - EUROPE +1; eu, us) - **SparkPost**: [Yahoo Mail Sending Delays](https://down.guide/sparkpost/DWN-f850247790) (Degraded; lasted 37m; started 2025-11-28 09:40 UTC; Events API - USA, SparkPost Application - USA, Event Webhooks - USA; us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-e15bf00734) (Degraded; lasted 1h 1m; started 2025-11-27 14:22 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [High response times on the API](https://down.guide/sparkpost/DWN-2fc75475aa) (Degraded; lasted 1h 37m; started 2025-11-27 11:24 UTC; Transmissions API - USA; us) - **SparkPost**: [Intermittent email api failures impacting EU customers](https://down.guide/sparkpost/DWN-b0ce280a72) (Degraded; lasted 1h 23m; started 2025-11-21 09:08 UTC; Transmissions API - EUROPE; eu) - **SparkPost**: [Webhook delays for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-b2abb5a232) (Degraded; lasted 2h 27m; started 2025-11-20 15:56 UTC; Event Webhooks - USA; eu, us) - **SparkPost**: [SMTP message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-212907c425) (Degraded; lasted 1h 35m; started 2025-11-11 14:35 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-d7b10615fa) (Degraded; lasted 1h 4m; started 2025-11-10 22:06 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-4485c030fc) (Degraded; lasted 3m; started 2025-11-04 21:33 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Outbound message delivery is slightly delayed/slow for some SparkPost customers (US hosted only)](https://down.guide/sparkpost/DWN-2c3db012c1) (Degraded; lasted 1h 53m; started 2025-10-28 18:51 UTC; SMTP Delivery - USA; eu, us) - **SparkPost**: [Transmissions API - Elevated error rate in US region](https://down.guide/sparkpost/DWN-29bb9fa2b7) (Degraded; lasted 1h 14m; started 2025-10-20 10:55 UTC; Transmissions API - USA; us) - **SparkPost**: [Captcha error for login with password](https://down.guide/sparkpost/DWN-c8379d8f46) (Degraded; lasted 3h 14m; started 2025-10-13 08:28 UTC; SparkPost Application - USA, SparkPost Application - EUROPE; eu, us) [Back to SparkPost](https://down.guide/sparkpost) --- down.guide reads providers' official status pages every minute and adds its own evidence, always labeled. 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