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    Kickbox outage history

    50 recorded Kickbox incidents since April 2015, with official updates, affected components, duration and resolution information.

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    Batch API outage

    Started August 27, 2026 at 3:49 AM UTC · 1h 15m

    OutageCritical incident
    Affected components
    ESP IntegrationsManagement InterfaceList VerificationVerification API
    1. August 27, 2026 at 3:49 AM UTCidentified

      The issues has been identified and we are working on a fix

    2. August 27, 2026 at 3:50 AM UTCidentified

      We are continuing to work on a fix for this issue.

    3. August 27, 2026 at 5:04 AM UTCresolved

      This incident has been resolved.

    List Upload Degredation

    Started January 19, 2026 at 3:17 PM UTC · 0m

    Pending
    Affected components
    List Verification
    1. January 19, 2026 at 3:17 PM UTCresolved

      This incident has been resolved.

    Web Application and Batch API Interruption

    Started January 16, 2026 at 2:13 AM UTC · 2h 10m

    OutageCritical incident
    Affected components
    WebsiteVerification API
    1. January 16, 2026 at 2:13 AM UTCinvestigating

      Currently investigating issue with web application and batch API.

    2. January 16, 2026 at 2:21 AM UTCidentified

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

    3. January 16, 2026 at 3:01 AM UTCidentified

      We are continuing to work on a fix for this issue.

    4. January 16, 2026 at 3:24 AM UTCmonitoring

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

    5. January 16, 2026 at 4:23 AM UTCresolved

      This incident has been resolved.

    Service Degradation - List Downloads

    Started August 21, 2025 at 7:30 PM UTC · 2h 32m

    Pending
    Affected components
    List Verification
    1. August 21, 2025 at 7:30 PM UTCinvestigating

      Currently investigating issue.

    2. August 21, 2025 at 8:26 PM UTCinvestigating

      We are still investigating an intermittent issue with list downloads.

    3. August 21, 2025 at 10:02 PM UTCresolved

      Incident resolved. Monitoring will take place for a time to ensure functionality.

    Verification result inconsistencies following Yahoo/AOL update

    Started June 2, 2025 at 2:42 PM UTC · 22h 35m

    IssuesMinor incident
    Affected components
    List VerificationVerification API
    1. June 2, 2025 at 2:42 PM UTCidentified

      We are actively addressing an issue causing inconsistencies in the verification results for Yahoo and AOL emails. This problem has been traced to a breaking change in a recent update from Yahoo/AOL that affects our results. We have identified the issue and we are working towards a resolution.

    2. June 2, 2025 at 9:03 PM UTCmonitoring

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

    3. June 3, 2025 at 1:17 PM UTCresolved

      This incident has been resolved.

    EU ONLY - System Outage

    Started February 21, 2025 at 12:24 PM UTC · 49m

    OutageCritical incident
    Affected components
    DocumentationESP IntegrationsWebsiteManagement InterfaceList VerificationVerification API
    1. February 21, 2025 at 12:24 PM UTCinvestigating

      Currently investigating an issue that is causing an outage on our EU instances.

    2. February 21, 2025 at 1:14 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. February 21, 2025 at 1:14 PM UTCresolved

      This incident has been resolved.

    Partial Outage for Account Sign-in and some API

    Started November 17, 2024 at 10:54 AM UTC · 1d 6h

    IssuesMinor incident
    Affected components
    WebsiteVerification API
    1. November 17, 2024 at 10:54 AM UTCinvestigating

      Issue currently under investigation.

    2. November 17, 2024 at 6:07 PM UTCmonitoring

      Fix implemented and results being monitored.

    3. November 18, 2024 at 5:41 PM UTCresolved

      Incident resolved.

    API Service Degradation

    Started October 24, 2024 at 3:25 PM UTC · 5d 1h

    IssuesMinor incident
    Affected components
    Verification API
    1. October 24, 2024 at 3:25 PM UTCinvestigating

      We are currently investigating and issue causing slower than normal API responses for a fraction of requests

    2. October 24, 2024 at 3:26 PM UTCidentified

      Issue identified. Preparing deployment for fix.

    3. October 24, 2024 at 3:51 PM UTCmonitoring

      A fix has been deployed. We are now monitoring services.

    4. October 29, 2024 at 5:18 PM UTCresolved

      This incident has been resolved.

    Partial API Outage

    Started September 14, 2024 at 11:37 PM UTC · 29m

    OutageMajor incident
    Affected components
    ESP IntegrationsManagement InterfaceList VerificationVerification API
    1. September 14, 2024 at 11:37 PM UTCinvestigating

      Partial outage. Investigating

    2. September 14, 2024 at 11:38 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. September 15, 2024 at 12:07 AM UTCresolved

      This incident has been resolved.

    Minor Service Degradation

    Started August 21, 2024 at 7:30 PM UTC · 0m

    IssuesMinor incident
    1. August 21, 2024 at 8:40 PM UTCresolved

      Team is investigating the cause of a minor service degradation occurring between 2:30pm and 3:00pm (central time). Details to come.

    2. August 22, 2024 at 5:15 PM UTCpostmortem

      # August 21, 2024 Service Degradation Investigation **Date**: 08/21/2024 **Status**: Mitigated ### Summary A service degradation was detected by our monitoring services between 12:34 PST and 12:48 PST. We removed the impacted servers from rotation restoring full-service. We investigated and solved the issue before bringing the impacted servers back into production rotation. ### Impact API service degradation in 45-second bursts for a 12 minute period, beginning at 12:34 PST causing some requests to respond with a 502 ‘Bad Gateway’. The issue was limited to a small subset of our production servers, so fewer than 3% of global API requests during this time were affected. ### Root Cause\(s\) During a routine canary upstream service update, a small number of canary servers became unable to connect to an upstream internal service. Due to this problem, a fraction of requests to these servers caused a connection timeout, resulting in 502 Bad Gateway errors from our proxies.This problem was sporadic, so the proxies did not automatically remove these servers from rotation. ### Resolution Our internal monitoring systems detected this degradation and we worked to manually remove these servers from production rotation. This restored the API to full health. After our investigation, we resolved the communication issues with a full code re-deploy and service restart. We then ran a full suite of API health checks, confirmed the problem was resolved, and re-added the servers into production. ‌ ### Action Items We will perform a review of our internal monitoring systems to decrease the time to alert, and review our proxy health-check endpoints to see if they can be improved for partial service degradation. ‌ ## Timeline

    ESP Integrations

    Started March 11, 2024 at 8:23 PM UTC · 92d 16h

    IssuesMinor incident
    Affected components
    ESP Integrations
    1. March 11, 2024 at 8:23 PM UTCidentified

      We’re currently experiencing reduced performance with several of our integrations, including Iterable, HubSpot, and Klaviyo within Kickbox, specifically affecting functionality; our team is actively working to resolve these issues to restore full service. Users can still actively leverage our email verification services through list verification or API. If you have any additional questions, please reach out to [email protected].

    2. June 12, 2024 at 12:56 PM UTCresolved

      This incident has been resolved.

    Partial API Outage

    Started March 5, 2024 at 4:30 PM UTC · 0m

    IssuesMinor incident
    1. March 5, 2024 at 6:47 PM UTCresolved

      A 7 minute unexpected partial outage occurred. Root cause still under investigation.

    EU Verification Outage

    Started March 5, 2024 at 3:08 PM UTC · 56m

    Pending
    Affected components
    List VerificationVerification API
    1. March 5, 2024 at 3:08 PM UTCinvestigating

      We are currently investigating an issue with the EU verification instance

    2. March 5, 2024 at 3:10 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. March 5, 2024 at 3:29 PM UTCmonitoring

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

    4. March 5, 2024 at 4:05 PM UTCresolved

      A networking error caused a severed connection to the EU verification engine. Manual reconnection has restored services.

    Web App Sign-in

    Started January 21, 2024 at 6:00 AM UTC · 0m

    Pending
    1. January 21, 2024 at 6:01 PM UTCresolved

      A DNS change with an Amazon service temporarily broke sign-in for some users Sunday morning (API unaffected.

    Unplanned Outage - API and WebApp

    Started January 8, 2024 at 4:30 PM UTC · 0m

    OutageCritical incident
    1. January 8, 2024 at 9:38 PM UTCresolved

      There was a small outage 10 minute outage due to an unforeseen network issue during a routine deployment.

    2. January 10, 2024 at 3:15 PM UTCpostmortem

      A minor configuration change \(adding an alias to a Redis instance\) caused an unexpected error and prevented the Kickbox app from restarting after deployment. The issue was quickly detected and resolved by the engineering team. The total outage was 11 minutes. The misconfiguration was identified quickly and a rollback tag was deployed to restore service within minutes.

    Degraded service - api and app

    Started September 22, 2023 at 1:04 PM UTC · 1h 37m

    Pending
    Affected components
    ESP IntegrationsManagement InterfaceList VerificationVerification API
    1. September 22, 2023 at 1:04 PM UTCinvestigating

      We're investigating a period of degraded service beginning at 5:54AM CST and lasting until 7:30AM CST.

    2. September 22, 2023 at 2:41 PM UTCresolved

      We had degraded service due to a partial datastore service degradation. We repaired and restarted the datastore. No data was lost.

    Partial Service Outage for some EU users

    Started September 20, 2023 at 8:22 PM UTC · 0m

    Pending
    1. September 20, 2023 at 8:38 PM UTCresolved

      An issue with a upstream service provider created a window of unplanned downtime for a small fraction of EU users (smaller than 1%). The partial service outage lasted from 3pm September 19th until about 3pm the next day.

    DMARC deliverablity tools suite

    Started September 5, 2023 at 5:43 PM UTC · 1d 2h

    IssuesMinor incident
    1. September 5, 2023 at 5:43 PM UTCinvestigating

      In the deliverablity tools suite, DMARC data has stopped populating as of September 1st. Engineering is investigating the issue and we hope to have more information and a resolution to this issue soon.

    2. September 5, 2023 at 9:02 PM UTCinvestigating

      Still investigating the case.

    3. September 6, 2023 at 7:53 PM UTCresolved

      This incident has been resolved.

    DMARC reporting system.

    Started August 17, 2023 at 5:10 PM UTC · 2h 40m

    OutageCritical incident
    1. August 17, 2023 at 5:10 PM UTCidentified

      Our system failed to properly log and summarized inbound aggregate DMARC reports. Our engineers are aware of the issue and are actively working to address this issue as soon as possible.

    2. August 17, 2023 at 7:50 PM UTCidentified

      We are continuing to work on a fix for this issue.

    3. August 17, 2023 at 7:50 PM UTCresolved

      We’ve corrected the issue with DMARC that was preventing ongoing data collection. Ongoing, inbound DMARC reports should be properly received, parsed, logged and displayed in reporting. If you have any questions, please don’t hesitate to reach out to us at [email protected]

    Partial API Outage

    Started August 8, 2023 at 4:00 PM UTC · 0m

    IssuesMinor incident
    1. August 8, 2023 at 5:26 PM UTCresolved

      Just after 11:00 am (central) a routine TLS certificate update caused a misconfiguration. Some users experienced a partial outage.

    2. August 8, 2023 at 6:16 PM UTCpostmortem

      The new SSL cert that was implemented did not support `TLS1.2` . This resulted in issues for only some users where that support was required.