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    Mailjet outage history

    51 recorded Mailjet incidents since December 2021, with official updates, affected components, duration and resolution information.

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    Microsoft Incident Resulting in Delivery Issues to M365

    Started September 4, 2026 at 12:23 PM UTC · 32m

    Pending
    1. September 4, 2026 at 12:23 PM UTCmonitoring

      Starting around 08:00 UTC, Microsoft began experiencing an incident causing an increased volume of deferred emails across all M365 regions. The affected responses are returning "451 4.7.500 Server busy". Our teams are actively monitoring the situation. Sending to other email providers is not affected.

    2. September 4, 2026 at 12:55 PM UTCresolved

      This incident has been resolved.

    Support Ticket Creation Failures

    Started June 5, 2026 at 10:01 AM UTC · 32m

    OutageCritical incident
    Affected components
    Support
    1. June 5, 2026 at 10:01 AM UTCinvestigating

      We are currently investigating this issue.

    2. June 5, 2026 at 10:25 AM UTCidentified

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

    3. June 5, 2026 at 10:26 AM UTCmonitoring

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

    4. June 5, 2026 at 10:33 AM UTCresolved

      This incident has been resolved.

    Lag on Event API

    Started October 14, 2025 at 1:30 PM UTC · 14h 12m

    OutageMajor incident
    Affected components
    Event API
    1. October 14, 2025 at 1:30 PM UTCinvestigating

      Lag are identified we are investigating the issue

    2. October 14, 2025 at 2:01 PM UTCidentified

      The issue has been identified and our team is working on a fix.

    3. October 14, 2025 at 3:52 PM UTCidentified

      The fix is under review.

    4. October 14, 2025 at 4:33 PM UTCidentified

      The fix is now under testing.

    5. October 14, 2025 at 6:57 PM UTCmonitoring

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

    6. October 14, 2025 at 8:13 PM UTCmonitoring

      We'll be monitoring the situation throughout the night until 9am CET to ensure stable service delivery.

    7. October 15, 2025 at 3:42 AM UTCmonitoring

      We are continuing to monitor for any further issues.

    8. October 15, 2025 at 3:42 AM UTCresolved

      This incident has been resolved.

    Latency and login issues with Mailjet Application

    Started October 2, 2025 at 9:24 AM UTC · 1h 17m

    IssuesMinor incident
    Affected components
    Mailjet App
    1. October 2, 2025 at 9:24 AM UTCinvestigating

      We are currently investigating this issue.

    2. October 2, 2025 at 9:24 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. October 2, 2025 at 9:40 AM UTCidentified

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

    4. October 2, 2025 at 10:05 AM UTCmonitoring

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

    5. October 2, 2025 at 10:40 AM UTCresolved

      This incident has been resolved.

    Latency and login issues with Mailjet Application

    Started October 1, 2025 at 8:12 AM UTC · 16h 31m

    IssuesMinor incident
    Affected components
    Statistics DisplayMailjet AppEvent API
    1. October 1, 2025 at 8:12 AM UTCinvestigating

      We are currently investigating this issue.

    2. October 1, 2025 at 9:08 AM UTCmonitoring

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

    3. October 1, 2025 at 10:56 AM UTCmonitoring

      We are continuing to monitor for any further issues. Events are being processed and the service is catching up on missing events.

    4. October 1, 2025 at 11:15 AM UTCmonitoring

      We are continuing to monitor for any further issues.

    5. October 1, 2025 at 8:30 PM UTCmonitoring

      We are continuing to actively monitor the system.

    6. October 2, 2025 at 12:42 AM UTCresolved

      This incident has been resolved.

    Delays in emails processing and general app.mailjet.com login issues

    Started September 30, 2025 at 10:21 AM UTC · 7h 44m

    OutageMajor incident
    Affected components
    Outgoing SMTPStatistics DisplayMailjet AppWebsite (Mailjet.com)REST APISEND API
    1. September 30, 2025 at 10:21 AM UTCinvestigating

      We are currently investigating an issue impacting email processing along with app.mailjet.com login issues, reflecting into "wrong password" errors.

    2. September 30, 2025 at 10:36 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. September 30, 2025 at 11:12 AM UTCidentified

      We have identified the root cause of the issue. While we are working on getting this resolved, clients will experience inability to log into app.mailjet.com as well as experience email processing delays.

    4. September 30, 2025 at 4:09 PM UTCidentified

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

    5. September 30, 2025 at 5:44 PM UTCmonitoring

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

    6. September 30, 2025 at 6:05 PM UTCresolved

      The incident has been resolved. Any missing statistics during the incident haven't been lost and will show up in the statistics page later today.

    Login issues with Mailjet Application and Intermittent Errors on REST API

    Started September 4, 2025 at 6:54 AM UTC · 5h 36m

    OutageCritical incident
    Affected components
    Mailjet EmbeddedMailjet AppForm BuilderREST API
    1. September 4, 2025 at 6:54 AM UTCinvestigating

      We are currently investigating this issue.

    2. September 4, 2025 at 8:34 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. September 4, 2025 at 8:55 AM UTCidentified

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

    4. September 4, 2025 at 10:33 AM UTCidentified

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

    5. September 4, 2025 at 11:11 AM UTCmonitoring

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

    6. September 4, 2025 at 12:30 PM UTCresolved

      This incident has been resolved.

    Connection issues related to Event API

    Started July 6, 2025 at 9:07 AM UTC · 19m

    OutageMajor incident
    Affected components
    Event API
    1. July 6, 2025 at 9:07 AM UTCinvestigating

      Our team is currently investigating a potential issue impacting some customers on webhook connection.

    2. July 6, 2025 at 9:11 AM UTCmonitoring

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

    3. July 6, 2025 at 9:26 AM UTCresolved

      This incident has been resolved.

    Campaigns may experience getting queued and not sent

    Started January 31, 2025 at 11:39 AM UTC · 2h 26m

    IssuesMinor incident
    Affected components
    Mailjet App
    1. January 31, 2025 at 11:39 AM UTCinvestigating

      We are currently investigating this issue.

    2. January 31, 2025 at 12:09 PM UTCidentified

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

    3. January 31, 2025 at 1:46 PM UTCmonitoring

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

    4. January 31, 2025 at 2:05 PM UTCresolved

      This incident has been resolved.

    Event sending issues related to Event API

    Started October 23, 2024 at 11:55 AM UTC · 3h 2m

    OutageMajor incident
    1. October 23, 2024 at 11:55 AM UTCinvestigating

      We are currently investigating issues with our Event API partially sending events.

    2. October 23, 2024 at 1:30 PM UTCidentified

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

    3. October 23, 2024 at 1:32 PM UTCmonitoring

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

    4. October 23, 2024 at 2:56 PM UTCresolved

      This incident has been resolved.

    Login issues with Mailjet Application

    Started October 1, 2024 at 12:24 PM UTC · 2h 44m

    OutageCritical incident
    Affected components
    Mailjet App
    1. October 1, 2024 at 12:24 PM UTCinvestigating

      We are currently investigating login issues on app

    2. October 1, 2024 at 12:38 PM UTCmonitoring

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

    3. October 1, 2024 at 3:08 PM UTCresolved

      This incident has been resolved.

    Login issues with Mailjet Application

    Started July 31, 2024 at 5:44 AM UTC · 5h 19m

    OutageCritical incident
    Affected components
    Mailjet App
    1. July 31, 2024 at 5:44 AM UTCidentified

      The issue has been identified and we are currently working through the fix

    2. July 31, 2024 at 8:13 AM UTCidentified

      The mitigation of the DDoS attack to our application is still in progress.

    3. July 31, 2024 at 8:36 AM UTCmonitoring

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

    4. July 31, 2024 at 9:17 AM UTCmonitoring

      We have implemented measures to mitigate the DDoS attack on our application and are continuously making adjustments to better withstand the attack. Some customers may report intermittent periods where the application experiences slowness or becomes unresponsive.

    5. July 31, 2024 at 10:51 AM UTCmonitoring

      We are continuing to monitor for any further issues.

    6. July 31, 2024 at 11:03 AM UTCresolved

      This incident has been resolved.

    Login issues with Mailjet Application

    Started July 30, 2024 at 12:25 PM UTC · 13h 30m

    OutageCritical incident
    Affected components
    Mailjet App
    1. July 30, 2024 at 12:25 PM UTCinvestigating

      We are currently investigating this issue.

    2. July 30, 2024 at 12:34 PM UTCidentified

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

    3. July 30, 2024 at 4:29 PM UTCidentified

      We are continuing to work through the fix for this issue

    4. July 30, 2024 at 7:06 PM UTCidentified

      The mitigation of the DDoS attack to our application is still in progress.

    5. July 30, 2024 at 10:05 PM UTCmonitoring

      The service is back but we're continuing to monitor its state to ensure there's no further issues.

    6. July 31, 2024 at 1:55 AM UTCresolved

      The service is back to normal.

    Latency and login issues with Mailjet Application

    Started May 31, 2024 at 8:07 AM UTC · 1h 41m

    OutageCritical incident
    Affected components
    Mailjet App
    1. May 31, 2024 at 8:07 AM UTCinvestigating

      We are currently investigating this issue.

    2. May 31, 2024 at 8:24 AM UTCidentified

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

    3. May 31, 2024 at 8:50 AM UTCmonitoring

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

    4. May 31, 2024 at 9:48 AM UTCresolved

      This incident has been resolved.

    Latency and login issues with Mailjet Application

    Started May 27, 2024 at 3:54 PM UTC · 2h 18m

    IssuesMinor incident
    Affected components
    Mailjet EmbeddedMailjet App
    1. May 27, 2024 at 3:54 PM UTCinvestigating

      We are currently investigating this issue.

    2. May 27, 2024 at 4:58 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. May 27, 2024 at 6:11 PM UTCresolved

      This incident has been resolved.

    Login Issues with Mailjet Application

    Started May 27, 2024 at 1:23 PM UTC · 50m

    OutageCritical incident
    Affected components
    Mailjet EmbeddedMailjet App
    1. May 27, 2024 at 1:23 PM UTCidentified

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

    2. May 27, 2024 at 1:48 PM UTCinvestigating

      We are currently investigating this issue.

    3. May 27, 2024 at 1:57 PM UTCmonitoring

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

    4. May 27, 2024 at 2:13 PM UTCresolved

      This incident has been resolved.

    Message Sending Delay

    Started December 11, 2023 at 3:23 PM UTC · 4h 5m

    IssuesMinor incident
    Affected components
    Outgoing SMTP
    1. December 11, 2023 at 3:23 PM UTCinvestigating

      We are currently investigating this issue.

    2. December 11, 2023 at 4:14 PM UTCinvestigating

      We are continuing to investigate this issue.

    3. December 11, 2023 at 4:30 PM UTCidentified

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

    4. December 11, 2023 at 5:05 PM UTCmonitoring

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

    5. December 11, 2023 at 6:15 PM UTCmonitoring

      Different fixes are being implemented and we are monitoring the results.

    6. December 11, 2023 at 6:31 PM UTCmonitoring

      Remediation is still in progress and outbound mail continues to be delayed.

    7. December 11, 2023 at 7:28 PM UTCresolved

      This incident has been resolved.

    Customers might experience a delay in statistics or showing messages in queued status. All emails are processed and sent

    Started October 9, 2023 at 10:12 AM UTC · 5h 43m

    IssuesMinor incident
    Affected components
    Statistics DisplayEvent API
    1. October 9, 2023 at 10:12 AM UTCinvestigating

      We are currently investigating this issue.

    2. October 9, 2023 at 10:13 AM UTCinvestigating

      We are continuing to investigate this issue.

    3. October 9, 2023 at 11:32 AM UTCidentified

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

    4. October 9, 2023 at 2:27 PM UTCmonitoring

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

    5. October 9, 2023 at 3:55 PM UTCresolved

      This incident has been resolved.

    Message Sending Delay

    Started September 15, 2023 at 3:00 AM UTC · 1h 39m

    IssuesMinor incident
    Affected components
    Outgoing SMTPSEND API
    1. September 15, 2023 at 3:00 AM UTCinvestigating

      Mailjet Engineering is investigating an email sending delay.

    2. September 15, 2023 at 4:25 AM UTCmonitoring

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

    3. September 15, 2023 at 4:40 AM UTCresolved

      This incident has been resolved.

    Degraded performance on campaign scheduling

    Started June 28, 2023 at 7:59 AM UTC · 1h 53m

    IssuesMinor incident
    Affected components
    Outgoing SMTP
    1. June 28, 2023 at 7:59 AM UTCinvestigating

      Some customers may report that scheduled campaigns are not being sent. Our teams are currently investigating this issue.

    2. June 28, 2023 at 8:06 AM UTCidentified

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

    3. June 28, 2023 at 8:47 AM UTCidentified

      Some customers may report degraded performance on sending campaigns or campaigns scheduled not being sent. Our teams are currently investigating this issue.

    4. June 28, 2023 at 9:25 AM UTCmonitoring

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

    5. June 28, 2023 at 9:52 AM UTCresolved

      This incident has been resolved.