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    Campaign Monitor outage history

    20 recorded Campaign Monitor incidents since November 2024, with official updates, affected components, duration and resolution information.

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    Microsoft delivery delays — customer update

    Started September 4, 2026 at 11:20 AM UTC · 17d 1h

    Pending
    Affected components
    Campaign emailsPreview emailsEmail sendingJourney emailsTransactional emails
    1. September 4, 2026 at 11:20 AM UTCupdate

      We're aware of an issue currently affecting email delivery to Microsoft domains (Outlook, Hotmail, Live). This is a receiver-side issue on Microsoft's end and is being seen industry-wide, with multiple email providers reporting the same behaviour this morning. It is not an indication of a problem with your account, your sending, or our platform. We've raised this directly with Microsoft and are awaiting their response. Mail to other providers is unaffected. We'll share an update as soon as we hear back. Thanks for your patience.

    2. September 4, 2026 at 1:22 PM UTCupdate

      We are continuing to monitor delivery of emails to Microsoft domains. Whilst we have seen some improvement and many emails are getting through, there is unfortunately continues to be a proportion of emails not being delivered successfully. We'll share an update as soon as we have more information.

    3. September 7, 2026 at 9:24 AM UTCupdate

      Delivery to Microsoft domains (Outlook, Hotmail, Live) has improved since last Friday. Some sending IPs are still seeing delays, so you may notice slower delivery to Microsoft addresses on some campaigns while this resolves or elevated soft bounces. This remains a receiver-side issue on Microsoft's end and is not related to your account, your sending, or our platform. We've been in contact with Microsoft and are continuing to monitor closely as delivery recovers. Thanks for your continued patience.

    4. September 11, 2026 at 7:23 AM UTCupdate

      Delivery to Microsoft domains has improved significantly, though we're still seeing fluctuations in successful delivery rates. We're continuing to monitor closely and make adjustments to mitigate the impact where we can. This remains a receiver-side issue on Microsoft's end and is not related to your account, your sending, or our platform. We've been in contact with Microsoft and are continuing to monitor closely as delivery recovers. In the meantime, we recommend holding off on resending campaigns to Microsoft-domain subscribers that have bounced until the issue is fully resolved.

    5. September 16, 2026 at 1:02 PM UTCupdate

      We are still seeing fluctuations in successful delivery rates to Microsoft domains. We're continuing to monitor closely and make adjustments to mitigate the impact where we can. This remains a receiver-side issue on Microsoft's end and is not related to your account, your sending, or our platform. If possible, we recommend holding off on resending campaigns to Microsoft-domain subscribers that have bounced until the issue is fully resolved.

    6. September 18, 2026 at 8:43 AM UTCupdate

      We know this issue has now been ongoing for an extended period, and we appreciate your patience while it continues to affect email delivery to Microsoft domains. To be clear, this remains a receiver-side issue on Microsoft's end — it is not related to your account, your sending, or our platform. Our deliverability team continue to be in contact with Microsoft as they work through this on their side. In terms of current state: bounce volumes related to this issue have continued to decline over the past week, and are currently at their lowest point since the issue began. That said, rates are still fluctuating, and some customers may continue to experience bounces to Microsoft domains intermittently. We are not yet in a position to mark this issue as resolved, and we're continuing to monitor closely as delivery recovers further.

    7. September 21, 2026 at 1:01 PM UTCresolved

      We're closing out this issue as our deliverability team has confirmed that bounce rates to Microsoft domains have stabilized within a normal, expected range, and we are no longer seeing the elevated bounce volumes associated with this issue. As a reminder, this was a receiver-side issue on Microsoft's end throughout, and was not related to your account, your sending, or our platform. We'd like to thank you for your patience while this was resolved on Microsoft's side. If you are still seeing elevated bounces to Microsoft-domain subscribers, please reach out to our support team so we can investigate further.

    Customers are unable to login to accounts

    Started July 16, 2026 at 11:07 AM UTC · 1h 9m

    OutageMajor incident
    Affected components
    Design & spam testingCampaign emailsAPISegment processingCampaign creation & previewsWebhooksPreview emailsEmail image hostingCampaign reporting (opens, clicks, Worldview)SMS sendingLog in & accessSignup formsHelp CenterEmail sendingAPI endpointsWeb applicationJourney emailsTransactional emailsCSS & JavaScriptInsightsPayment processingJourney builderEmail builderTransactional SMTPTransactional reportingMarketing websiteTemplatesLists & subscribersRSS feed reader
    1. July 16, 2026 at 11:07 AM UTCupdate

      It is not possible to login to Campaign Monitor at this time, our team are aware of the cause and are working to have this sorted as soon as possible.

    2. July 16, 2026 at 11:40 AM UTCupdate

      Our engineering team continues to investigate the issue and is working to resolve it as quickly as possible. While the application is currently unavailable, this does not affect emails that have already been sent — links and images within those emails will continue to work as expected.

    3. July 16, 2026 at 12:02 PM UTCupdate

      Our team has resolved the issue, and the application is now operating as normal. We will continue to monitor the situation closely and will update the status page with any further information.

    4. July 16, 2026 at 12:16 PM UTCresolved

      The application is now working normally and customers can now login without any issues. Any campaigns scheduled to send during the period the application was unavailable will now send. Unfortunately, Transactional emails that were triggered during this period won't have been sent and will need to be re-triggered.

    Issues affecting sign up forms

    Started June 22, 2026 at 12:33 AM UTC · 2h 24m

    IssuesMinor incident
    Affected components
    Signup formsWeb application
    1. June 22, 2026 at 12:33 AM UTCupdate

      We are currently investigating an issue where sign up forms cannot be edited or previewed within the application. Published sign up forms remain fully functional and are not impacted. We are working to identify the root cause and restore full functionality. We will provide updates as more information becomes available.

    2. June 22, 2026 at 2:41 AM UTCupdate

      A fix has been implemented, and we are currently verifying that all functionality is working as expected before resolving this incident. Customers should no longer experience issues with sign up forms. We will continue to monitor performance.

    3. June 22, 2026 at 2:57 AM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues with sign up forms.

    Problems accessing SMS Sending and Settings

    Started April 1, 2026 at 7:27 AM UTC · 19h 20m

    IssuesMinor incident
    Affected components
    SMS sending
    1. April 1, 2026 at 7:27 AM UTCupdate

      Customers that have access to SMS are not currently able to access SMS settings or send SMS campaigns. This issue does not impact email sending or email campaigns. Our engineering team are working on resolving this issue as soon as possible.

    2. April 2, 2026 at 2:47 AM UTCresolved

      The incident has now been resolved. Customers should no longer experience problems accessing SMS Settings or sending SMS campaigns.

    Delays importing subscribers

    Started March 4, 2026 at 9:56 AM UTC · 54m

    IssuesMinor incident
    Affected components
    Web applicationLists & subscribers
    1. March 4, 2026 at 9:56 AM UTCupdate

      We are currently seeing delays when importing subscribers via the API or within the application. Our engineering team are working on a resolution.

    2. March 4, 2026 at 10:11 AM UTCupdate

      Our engineering team have identified the cause and are now processing the backlog of imports, we currently expect this to be complete in approximately 30 minutes.

    3. March 4, 2026 at 10:49 AM UTCupdate

      This issue has now been resolved and there are no longer any delays importing subscribers.

    4. March 4, 2026 at 10:50 AM UTCresolved

      This issue has now been resolved and there are no longer any delays importing subscribers.

    Subscriber imports are delayed

    Started March 3, 2026 at 8:35 AM UTC · 1h 52m

    IssuesMinor incident
    Affected components
    Web applicationLists & subscribers
    1. March 3, 2026 at 8:35 AM UTCupdate

      Customers may experience issues importing subscribers to a list. Imports are processing, but they are taking much longer than normal.

    2. March 3, 2026 at 10:27 AM UTCresolved

      Our engineering team have been able to resolve the issue and imports are now processing normally.

    Automated Journeys not triggering

    Started February 19, 2026 at 12:18 PM UTC · 8h 38m

    IssuesMinor incident
    Affected components
    Email sendingWeb applicationJourney emailsJourney builder
    1. February 19, 2026 at 12:18 PM UTCupdate

      Customers may experience issues triggering automated journeys at this time. Our engineering team are aware and currently investigating. Thank you for your patience.

    2. February 19, 2026 at 1:17 PM UTCupdate

      We are continuing to work on a fix and will provide further updates. Customers may currently experience delays in automated journey emails being sent..

    3. February 19, 2026 at 7:29 PM UTCupdate

      We are continuing to work on a fix and will provide further updates. Customers may currently experience delays in automated journey emails being sent.

    4. February 19, 2026 at 8:43 PM UTCupdate

      A fix has been implemented and we are verifying that everything is working as expected before resolving the status page. Customers should no longer experience delays in triggering journeys, though we are monitoring results.

    5. February 19, 2026 at 8:56 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience delayed automated journey triggers.

    Issues accessing CM account

    Started January 19, 2026 at 12:38 AM UTC · 20m

    IssuesMinor incident
    Affected components
    Design & spam testingCampaign emailsAPISegment processingCampaign creation & previewsWebhooksPreview emailsEmail image hostingCampaign reporting (opens, clicks, Worldview)Log in & accessSignup formsEmail sendingAPI endpointsWeb applicationJourney emailsTransactional emailsCSS & JavaScriptInsightsPayment processingJourney builderEmail builderTransactional SMTPTransactional reportingTemplatesLists & subscribersRSS feed reader
    1. January 19, 2026 at 12:38 AM UTCupdate

      We are aware that some customers are experiencing access issues with CM. We are currently investigating and will keep you updated.

    2. January 19, 2026 at 12:58 AM UTCresolved

      The incident has now been resolved. Customers should no longer experience the access issue.

    Issues importing subscribers

    Started November 7, 2025 at 7:04 PM UTC · 39m

    IssuesMinor incident
    Affected components
    Web applicationLists & subscribers
    1. November 7, 2025 at 7:04 PM UTCupdate

      We’ve received reports that some customers are having trouble importing subscribers. We are currently investigating and will keep you updated.

    2. November 7, 2025 at 7:32 PM UTCupdate

      Imports have caught up and we are verifying that everything is working as expected before resolving the status page. Customers should no longer experience issues importing subscribers, though we are monitoring results.

    3. November 7, 2025 at 7:43 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues importing subscribers.

    Issues importing subscribers

    Started October 23, 2025 at 1:56 PM UTC · 4h 4m

    IssuesMinor incident
    Affected components
    Web applicationLists & subscribers
    1. October 23, 2025 at 1:56 PM UTCupdate

      We’ve received reports that some customers are having trouble importing subscribers. We are currently investigating and will keep you updated.

    2. October 23, 2025 at 2:51 PM UTCupdate

      We are continuing to work on a fix and will provide further updates. Customers may currently experience issues importing subscribers.

    3. October 23, 2025 at 4:28 PM UTCupdate

      A fix is in progress, but customers may continue to experience delays importing subscribers while the backlog of data is processed. We are continuing to monitor the issue and will provide further updates.

    4. October 23, 2025 at 4:53 PM UTCupdate

      Imports have caught up and we are verifying that everything is working as expected before resolving the status page. Customers should no longer experience issues importing subscribers, though we are monitoring results.

    5. October 23, 2025 at 6:00 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues importing subscribers.

    Issues accessing email builder

    Started September 21, 2025 at 11:55 PM UTC · 24m

    OutageMajor incident
    Affected components
    Web applicationEmail builder
    1. September 21, 2025 at 11:55 PM UTCupdate

      Some customers experienced errors when accessing email builder. The issue was identified and systems were fully restored.

    2. September 22, 2025 at 12:19 AM UTCresolved

      The issue has now been resolved. Customers should no longer experience errors when accessing email builder.

    Issues with design & spam tests

    Started August 20, 2025 at 1:35 PM UTC · 8h 1m

    IssuesMinor incident
    Affected components
    Design & spam testingWeb application
    1. August 20, 2025 at 1:35 PM UTCupdate

      Some customers may currently experience issues with the design & spam tests found under "Run inbox tests." We are working to resolve this as soon as we can. Thanks for your patience.

    2. August 20, 2025 at 2:43 PM UTCupdate

      We are continuing to work on a fix and will provide further updates. Customers may currently experience issues running design & spam tests.

    3. August 20, 2025 at 9:36 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues running design & spam tests.

    Segment processing issues

    Started August 1, 2025 at 4:00 PM UTC · 2h 30m

    IssuesMinor incident
    Affected components
    Segment processingWeb application
    1. August 1, 2025 at 4:00 PM UTCupdate

      Some customers may currently experience issues creating and updating segments. We are working to resolve this as soon as we can. Thanks for your patience.

    2. August 1, 2025 at 6:30 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues creating and updating segments.

    Insights database update

    Started June 12, 2025 at 1:00 AM UTC · 1h 4m

    IssuesMinor incident
    Affected components
    Web applicationInsights
    1. June 12, 2025 at 1:00 AM UTCupdate

      We're currently performing an update to the Insights database. This process is expected to take approximately 1 hour, during which time Insights will be unavailable. Insights data backlog will be processed once the update is complete. No impacts on other areas of the application are expected.

    2. June 12, 2025 at 2:04 AM UTCresolved

      Updates to the Insights database have been successfully completed. Insights is now available. Thank you for your patience.

    Delays importing subscribers

    Started May 15, 2025 at 9:58 AM UTC · 1h 24m

    IssuesMinor incident
    Affected components
    Web applicationLists & subscribers
    1. May 15, 2025 at 9:58 AM UTCupdate

      Some customers may currently experience delays when importing subscribers. We are working to resolve this as soon as we can. Thanks for your patience.

    2. May 15, 2025 at 10:27 AM UTCupdate

      Our engineering team have been able to ensure that subscribers can be imported successfully. We are currently investigating the root cause to avoid any further issues.

    3. May 15, 2025 at 11:22 AM UTCresolved

      Our engineering team have resolved the problem here and there are no further issues importing subscribers.

    Issues processing payments

    Started February 14, 2025 at 11:12 PM UTC · 9h 20m

    IssuesMinor incident
    Affected components
    Web applicationPayment processing
    1. February 14, 2025 at 11:12 PM UTCupdate

      Some customers may experience issues with processing payments and adding credit cards. This is due to an issue affecting payment processor Braintree (A PayPal Service).

    2. February 15, 2025 at 2:56 AM UTCupdate

      Payments are now being processed. We're continuing to monitor this before confirming that there are no further issues.

    3. February 15, 2025 at 8:32 AM UTCresolved

      The service disruption affecting payment processor Braintree (A PayPal Service) has been resolved. Customers should no longer experience issues with payment processing or adding credit cards.

    Issue processing payments

    Started February 13, 2025 at 6:41 AM UTC · 5h 16m

    IssuesMinor incident
    Affected components
    Web applicationPayment processing
    1. February 13, 2025 at 6:41 AM UTCupdate

      Some customers may experience issues with processing payments and adding credit cards. This is due to an issue affecting payment processor Braintree (A PayPal Service).

    2. February 13, 2025 at 9:13 AM UTCupdate

      Our payment processor have indicated that problems have been resolved, we're continuing to monitor this before confirming that there are no further issues.

    3. February 13, 2025 at 11:57 AM UTCresolved

      The service disruption affecting payment processor Braintree (A PayPal Service) has been resolved. Customers should no longer experience issues with payment processing or adding credit cards.

    Issue processing payments

    Started February 13, 2025 at 4:21 AM UTC · 1h 42m

    IssuesMinor incident
    Affected components
    Web applicationPayment processing
    1. February 13, 2025 at 4:21 AM UTCupdate

      Some customers may experience issues with processing payments and adding credit cards. This is due to an issue affecting payment processor Braintree (A PayPal Service).

    2. February 13, 2025 at 6:03 AM UTCresolved

      The service disruption affecting payment processor Braintree (A PayPal Service) has been resolved. Customers should no longer experience issues with payment processing or adding credit cards.

    Issues sending test emails

    Started January 23, 2025 at 6:52 PM UTC · 1h 25m

    IssuesMinor incident
    Affected components
    Preview emailsEmail sending
    1. January 23, 2025 at 6:52 PM UTCupdate

      We’ve received reports that some customers are having trouble sending test emails. We are currently investigating and will keep you updated.

    2. January 23, 2025 at 7:23 PM UTCupdate

      We are continuing to work on a fix and will provide further updates. Customers may currently experience issues sending test emails.

    3. January 23, 2025 at 7:59 PM UTCupdate

      A fix has been implemented and we are verifying that everything is working as expected before resolving the status page. Customers should no longer experience issues receiving test emails though we are monitoring results.

    4. January 23, 2025 at 8:17 PM UTCresolved

      The incident has now been resolved. Customers should no longer experience issues receiving test emails.

    Issues accessing accounts

    Started November 21, 2024 at 6:40 AM UTC · 14m

    IssuesMinor incident
    Affected components
    Design & spam testingCampaign emailsAPISegment processingCampaign creation & previewsWebhooksPreview emailsEmail image hostingCampaign reporting (opens, clicks, Worldview)SMS sendingLog in & accessSignup formsHelp CenterEmail sendingAPI endpointsWeb applicationJourney emailsTransactional emailsCSS & JavaScriptInsightsPayment processingJourney builderEmail builderTransactional SMTPTransactional reportingMarketing websiteTemplatesLists & subscribersRSS feed reader
    1. November 21, 2024 at 6:40 AM UTCupdate

      We’ve received reports that some customers are having trouble accessing accounts. We are currently investigating and will keep you updated.

    2. November 21, 2024 at 6:54 AM UTCresolved

      The issue has now been resolved. Customers should no longer experience problems accessing accounts.