Aug <var data-var='date'> 4</var>, <var data-var='time'>02:00</var> EDT Completed - The scheduled maintenance has been completed. Aug <var data-var='date'> 3</var>, <var data-var='time'>22:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Aug <var data-var='date'> 3</var>, <var data-var='time'>16:19</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Monday, August 3, 2026, at 10:00 PM ET. This update includes essential database improvements and may result in brief delays in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow may be interrupted intermittently for up to 30 minutes during the window. Important Note: This will only cause a temporary delivery delay — no emails will be lost. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

Scheduled Maintenance for Shield

Aug <var data-var='date'> 3</var>, <var data-var='time'>14:31</var> EDT Resolved - The queues have caught up, and performance is operating at expected levels. Aug <var data-var='date'> 3</var>, <var data-var='time'>14:14</var> EDT Monitoring - At approximately 1:00 PM ET, we were alerted to slow message processing in Shield. The symptoms were slow message updates and some delivery delays. The team has identified the bottleneck and resolved the issue. The queues are catching up, and performance appears to be normalizing. We will continue to monitor the queue for full resolution.

Slow processing of Shield messages

Jul <var data-var='date'>22</var>, <var data-var='time'>23:00</var> EDT Completed - The scheduled maintenance has been completed. Jul <var data-var='date'>22</var>, <var data-var='time'>21:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jul <var data-var='date'>20</var>, <var data-var='time'>19:10</var> EDT Scheduled - We will be performing scheduled maintenance on CloudFilter Mail Flow Status in the Mailprotector Console on Wed, July 22, 2026, at 9:00 PM ET. This update includes essential system updates and may result in brief notification delays if a domain's mail flow status changes. Maintenance Window: 2 hours Expected Impact: If the mail flow status of a CloudFilter-protected domain changes during maintenance, the status change notification may be delayed. Important Note: This maintenance does not impact inbound or outbound mail flow. Thank you for your understanding as we work to enhance performance and reliability.

Scheduled Maintenance for CloudFilter Mail Flow Status Notifications

Jul <var data-var='date'>13</var>, <var data-var='time'>15:44</var> EDT Resolved - Email logs for CloudFilter have caught up, and current logs are displaying as expected. Jul <var data-var='date'>13</var>, <var data-var='time'>11:12</var> EDT Monitoring - Email log data stopped shipping to the storage layer. The team has resolved the log shipping, and the logs are recovering. Log backfill will continue well into the afternoon, and we will update this notice once the logs have caught up. Jul <var data-var='date'>13</var>, <var data-var='time'>10:33</var> EDT Investigating - Email log data for CloudFilter is not visible in the Console. The issue appears to have started approximately 9:00 AM ET this morning. The team is investigating the issue, and we will provide more information as soon as we can.

CloudFilter mail log data not showing

Jun <var data-var='date'> 5</var>, <var data-var='time'>10:41</var> EDT Resolved - Support tickets and repllies are back to originating from mailprotector.com. No changes or actions need to be taken. Support emails will resume their normal behavior. Jun <var data-var='date'> 4</var>, <var data-var='time'>10:55</var> EDT Update - Support tickets and replies from Mailprotector will temporarily originate from a zendesk.com email address rather than our standard mailprotector.com domain. This is an intentional change we made to restore email reply functionality to our ticketing system. Emails arriving from zendesk.com on behalf of Mailprotector Support are legitimate. If your email filtering flags these messages as possible impersonation, they are safe to release and trust. We will update this notice when we return to our standard domain. Jun <var data-var='date'> 4</var>, <var data-var='time'>09:45</var> EDT Identified - We are currently experiencing an issue with our Microsoft 365 tenant that is preventing us from receiving email replies to our support address. We are working to resolve this. If you need to reach us, please log into the support portal (support.mailprotector.com) and submit or update your request there. Portal submissions are working normally and will reach our team. We will update this notice once email replies are restored.

Replies to Support team not being processed

Jun <var data-var='date'> 4</var>, <var data-var='time'>09:41</var> EDT Resolved - This incident has been resolved. Jun <var data-var='date'> 3</var>, <var data-var='time'>17:12</var> EDT Update - We have begun reprocessing and redelivering emails that bounced during the affected time period. Here is what to expect: Most emails should be delivered, but not all of them. Some bounces during the incident may have been legitimate, and those messages will not be recoverable through reprocessing. Duplicates are possible. If a sender resent their email after the incident and the original message is also redelivered through our reprocessing, recipients may receive both. This is expected behavior and not a cause for concern. Reprocessing takes time. We expect this to be completed by midnight ET tonight, though it may finish sooner. Jun <var data-var='date'> 3</var>, <var data-var='time'>15:26</var> EDT Monitoring - Earlier today, Microsoft identified some of Shield's services as suspicious or compromised. This caused emails to bounce or be delayed. As of approximately 2:30 PM ET, the status began to lift, and we observed a return to expected mail flow. A support request has been opened with Microsoft to help us determine how and why this incident happened. We have not received a response yet. We are not closing this issue as resolved. Our intention is to get to the root of the incident. Our first priority was to find a way to resume normal mail flow, and it appears we have done so. We are continuing to monitor the situation, including the Microsoft notice regarding mail flow issues in Exchange Online, which appear to have been resolved. Jun <var data-var='date'> 3</var>, <var data-var='time'>12:33</var> EDT Update - Microsoft Defender is restricting connectors due to false-positive reports. Please go to Microsoft Defender > Restricted Entities and unblock the listed connectors. (https://security.microsoft.com/restrictedentities) You will need to monitor and check on this restriction for the time being. We have observed that Microsoft restricts the connector after a short time, and the unblock request must be made again. We are continuing to monitor and investigate possible mitigation options. Jun <var data-var='date'> 3</var>, <var data-var='time'>11:46</var> EDT Identified - Microsoft is experiencing intermittent issues with mail flow. Please see their notice for reference. https://admin.cloud.microsoft/#/servicehealth/:/alerts/EX1331830 Mailprotector is monitoring the situation. However, mail flow with CloudFilter and Shield appears to be normal. Please check logs to identify bounces or delays from Microsoft hosts to confirm potential effects from their systems.

Microsoft Exchange Online experiencing intermittent mail flow issues

May <var data-var='date'>29</var>, <var data-var='time'>02:00</var> EDT Completed - The scheduled maintenance has been completed. May <var data-var='date'>28</var>, <var data-var='time'>22:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. May <var data-var='date'>28</var>, <var data-var='time'>12:12</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Thu, May 28, 2026, at 10:00 PM ET. This update includes essential database improvements and may result in brief delays in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow should not be impacted during the window. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

May <var data-var='date'>28</var>, <var data-var='time'>02:00</var> EDT Completed - The scheduled maintenance has been completed. May <var data-var='date'>27</var>, <var data-var='time'>22:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. May <var data-var='date'>27</var>, <var data-var='time'>12:03</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Wed, May 27, 2026, at 10:00 PM ET. This update includes essential database improvements and may result in brief delays in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow should not be impacted during the window. Important Note: This will only cause a temporary delivery delay — no emails will be lost. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

May <var data-var='date'>14</var>, <var data-var='time'>02:00</var> EDT Completed - The scheduled maintenance has been completed. May <var data-var='date'>13</var>, <var data-var='time'>22:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. May <var data-var='date'>11</var>, <var data-var='time'>10:34</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Wed, May 13, 2026, at 10:00 PM ET. This update includes essential database improvements and may result in brief delays in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow may be interrupted for up to 30 minutes during the window. Important Note: This will only cause a temporary delivery delay — no emails will be lost. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

May <var data-var='date'> 1</var>, <var data-var='time'>11:00</var> EDT Resolved - This morning, a third-party package repository used by our virus scanning infrastructure experienced an outage following an attack on its systems. Because our virus scanning instances rely on this repository at startup to pull the latest files and configurations, affected instances were unable to start. This reduced the capacity of our virus-scanning cluster below demand. When a virus scan cannot complete, our system quarantines the email as a precaution. As a result, emails processed during this window were quarantined rather than delivered to inboxes. No emails were lost. Affected emails can be released from quarantine by users or admins. Resolution The virus scanning cluster has been reconfigured to pull packages directly from the source repository, eliminating the dependency on the third-party intermediary. Monitoring and alerting thresholds have also been updated to surface this class of issue more quickly in the future. The issue is fully resolved.

Virus scans in CloudFilter were unable to complete

Apr <var data-var='date'> 9</var>, <var data-var='time'>01:00</var> EDT Completed - The scheduled maintenance has been completed. Apr <var data-var='date'> 8</var>, <var data-var='time'>21:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Apr <var data-var='date'> 6</var>, <var data-var='time'>18:02</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Wed, Apr 8, 2026, at 9:00 PM ET. This update includes essential database improvements and may result in brief delays in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow may be interrupted for up to 30 minutes during the window. Important Note: This will only cause a temporary delivery delay — no emails will be lost. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

Apr <var data-var='date'> 8</var>, <var data-var='time'>19:01</var> EDT Resolved - This incident has been resolved. Apr <var data-var='date'> 8</var>, <var data-var='time'>14:07</var> EDT Monitoring - We have been made aware that emails sent from Google Workspace accounts via CloudFilter/SafeSend are failing intermittently. There may also be delays in delivering inbound email due to an issue Google is experiencing. If you have a domain affected by this incident, we recommend temporarily disabling the outbound mail routes for Gmail. You may check the status of Google's incident at https://support.cloud.google.com/portal/system-status?product=WORKSPACE&cssp=true

Unable to send or receive email with Google Workspace intermittently

Mar <var data-var='date'>26</var>, <var data-var='time'>16:14</var> EDT Resolved - An update released at approximately 2:00 PM ET today was designed to improve protection against brand impersonation. It behaved more aggressively than intended, holding and jailing legitimate emails, particularly those with signatures containing social media links. The update was rolled back at approximately 2:50 PM ET. This issue is resolved. Actions taken to remediate after rollback: - Inbound emails delivered to Junk have been reprocessed to ensure appropriate risk and moved to the Inbox. - Released jailed emails; they may still land in Junk if the sender is new or carries a medium risk level. - Outgoing emails that were held have been released. No action needed. Mar <var data-var='date'>26</var>, <var data-var='time'>15:19</var> EDT Update - Emails that were delivered to the Jail due to the aggressive behavior of the update have been released. The emails may still end up in the Junk E-mail folder if the risk level is medium or low from a new sender. Mar <var data-var='date'>26</var>, <var data-var='time'>15:06</var> EDT Monitoring - An update to improve brand-related impersonation attacks was aggressively holding outgoing messages and sending inbound emails to the Junk E-mail folder. The update has been rolled back, and the held outgoing emails have been released. Emails delivered to the Junk E-mail folder must be moved out by users. The aggressive protection was active from approximately 2:00 PM ET to 3:00 PM ET.

Shield aggressively holding messages

Jan <var data-var='date'>23</var>, <var data-var='time'>08:50</var> EST Resolved - This incident has been resolved. Jan <var data-var='date'>22</var>, <var data-var='time'>18:38</var> EST Update - We will continue to monitor the status Microsoft provides at https://status.cloud.microsoft/. It appears Microsoft is making progress in some of their affected zones. Logs shows some emails are beginning to deliver, but without Microsoft's confirmation of a resolution, we expect deferrals to continue. Jan <var data-var='date'>22</var>, <var data-var='time'>17:36</var> EST Update - Microsoft's status has not changed. For more information, please visit https://status.cloud.microsoft/ Jan <var data-var='date'>22</var>, <var data-var='time'>14:51</var> EST Monitoring - Microsoft has announced a service issue affecting Exchange Online in M365. We are seeing email delivery delays to M365 domains with temporary error notifications. We will continue to monitor the Microsoft report. Mailprotector's CloudFilter and Shield services are operational.

Mail delivery delays to Microsoft 365 domains

Jan <var data-var='date'>22</var>, <var data-var='time'>01:00</var> EST Completed - The scheduled maintenance has been completed. Jan <var data-var='date'>21</var>, <var data-var='time'>21:00</var> EST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Jan <var data-var='date'>19</var>, <var data-var='time'>15:40</var> EST Scheduled - We will be performing scheduled maintenance on CloudMail (hosted IMAP email) and XtraMail (continuity webmail) on Wednesday, January 21, 2026, at 9:00 PM ET. This update includes essential database updates and may result in a brief login interruption. Maintenance Window: 4 hours Expected Impact: Logging into CloudMail or XtraMail accounts may intermittently fail. Mail flow will not be interrupted. Important Note: Logging in via webmail or an email client will be affected. Thank you for your understanding as we work to maintain CloudMail and XtraMail performance and reliability.

Scheduled Maintenance for CloudMail and XtraMail

Dec <var data-var='date'>18</var>, <var data-var='time'>18:08</var> EST Resolved - The log ingestion issue is resolved, and logs have been backfilled. Dec <var data-var='date'>18</var>, <var data-var='time'>17:06</var> EST Identified - The team has identified an issue with email log ingestion and backend storage. A fix is being prepared. Logs will get backfilled once the issue is resolved. The log issue does not impact mail flow. Email delivery is performing as expected.

Mail log ingestion issue on CloudFilter

Dec <var data-var='date'>12</var>, <var data-var='time'>12:48</var> EST Resolved - The fix has been deployed. New emails are being placed in the appropriate location as expected per X-ray log details. Emails that were not moved prior to the fix will remain in their current location. Moving the message will create an opportunity for Shield to act on the message, if needed. Dec <var data-var='date'>12</var>, <var data-var='time'>11:21</var> EST Identified - An issue with API notifications from Microsoft was discovered, and a fix is already being deployed. Mail flow has not been interrupted; however, the movement of emails to a folder based on sender preferences or risk level without mailbox rules was impacted. The fix is being deployed.

API notifications with Microsoft interrupted

Dec <var data-var='date'>10</var>, <var data-var='time'>01:30</var> EST Completed - The scheduled maintenance has been completed. Dec <var data-var='date'> 9</var>, <var data-var='time'>21:30</var> EST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Nov <var data-var='date'>13</var>, <var data-var='time'>13:00</var> EST Scheduled - We will be performing scheduled maintenance on the Console email log infrastructure on Tuesday, December 9, 2025, at 9:30 PM ET. This update includes email logging updates and will result in intermittent log view availability in the Console. Maintenance Window: 4 hours Expected Impact: Email logs will be intermittently unavailable during the maintenance. Mail flow should remain unaffected. Important Note: Log access will be temporarily suspended — no logs are expected to be lost. Thank you for your understanding as we work to enhance the Console and CloudFilter's log performance and reliability.

Scheduled Maintenance for Console Logs

Nov <var data-var='date'>22</var>, <var data-var='time'>08:00</var> EST Completed - The scheduled maintenance has been completed. Nov <var data-var='date'>22</var>, <var data-var='time'>04:00</var> EST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Nov <var data-var='date'> 8</var>, <var data-var='time'>12:21</var> EST Scheduled - We will be performing scheduled maintenance on Shield on Saturday, November 22, 2025, at 4:00 AM ET. This update includes essential database and platform improvements and may result in a brief pause in mail flow. Maintenance Window: 4 hours Expected Impact: Mail flow may be interrupted for up to 15 minutes during the window. Important Note: This will only cause a temporary delivery delay — no emails will be lost. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

Nov <var data-var='date'> 8</var>, <var data-var='time'>08:00</var> EST Completed - The scheduled maintenance has been completed. Nov <var data-var='date'> 8</var>, <var data-var='time'>04:00</var> EST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Oct <var data-var='date'>17</var>, <var data-var='time'>17:03</var> EDT Scheduled - We will be performing scheduled maintenance on Shield on Saturday, November 8, 2025, at 4:00 AM ET. This update includes essential database improvements. Mail flow is not expected to be impacted. Maintenance Window: 4 hours Expected Impact: Mail flow will not be interrupted during the window. Thank you for your understanding as we work to enhance Shield’s performance and reliability.

Oct <var data-var='date'>29</var>, <var data-var='time'>17:53</var> EDT Resolved - This incident has been resolved. Oct <var data-var='date'>29</var>, <var data-var='time'>09:50</var> EDT Monitoring - Radar is operating as expected. However, AWS has not confirmed that the affected service has been fully resolved. We will continue to monitor the situation. Oct <var data-var='date'>28</var>, <var data-var='time'>19:25</var> EDT Update - We are continuing to monitor the situation. AWS is continuing to investigate the issue. Oct <var data-var='date'>28</var>, <var data-var='time'>17:09</var> EDT Identified - An underlying issue at AWS is preventing an essential Radar task from completing. Radar will not complete the round-trip test and return results. We continue to monitor AWS's investigation into the failed service.

Radar tests failng to complete

Oct <var data-var='date'>27</var>, <var data-var='time'>14:01</var> EDT Resolved - This incident has been resolved. Oct <var data-var='date'>27</var>, <var data-var='time'>10:47</var> EDT Monitoring - Connections to CloudMail are operating as expected. We will continue to monitor the status. Oct <var data-var='date'>27</var>, <var data-var='time'>10:08</var> EDT Investigating - We are investigating errors connecting to CloudMail via webmail and email clients.

CloudMail client connections timing out

Oct <var data-var='date'>20</var>, <var data-var='time'>19:09</var> EDT Resolved - Quarantine queues are continuing recovery and services appear to be operating as expected. We will monitor the AWS status through the morning. Oct <var data-var='date'>20</var>, <var data-var='time'>17:19</var> EDT Monitoring - Quarantine services are beginning to recover. We continue to monitor the progress reported by AWS and the recovery of queues and services affected by the outage. Oct <var data-var='date'>20</var>, <var data-var='time'>16:26</var> EDT Update - The Mailprotector Console is back online. Quarantined emails continue to be queued and "good" emails are delivering to recipient servers. Oct <var data-var='date'>20</var>, <var data-var='time'>16:13</var> EDT Update - The Mailprotector Console is currently unavailable due to the AWS issues. Mail flow for good emails continues to operate as expected. To reiterate, good emails are being delivered to recipient servers. The Console and quarantine are currently affected. Oct <var data-var='date'>20</var>, <var data-var='time'>14:18</var> EDT Update - AWS has reported progress but quarantine performance effects remain. We are continuing to monitor and work with AWS. Oct <var data-var='date'>20</var>, <var data-var='time'>11:53</var> EDT Identified - AWS is experiencing service issues that are impacting CloudFilter's quarantine. Emails destinated for the quarantine are queued. Emails passing filtering are being delivered to the destination recipients. Only quarantined emails are affected. You can follow the AWS updates at https://health.aws.amazon.com/health/status

Quarantined emails queued due to AWS issue

Oct <var data-var='date'> 3</var>, <var data-var='time'>15:06</var> EDT Resolved - This incident has been resolved. Oct <var data-var='date'> 1</var>, <var data-var='time'>05:14</var> EDT Monitoring - A server service was unstable. The team has resolved the issue. Webmail and IMAP access is working as expected. We are continuing to monitor the service. Oct <var data-var='date'> 1</var>, <var data-var='time'>04:14</var> EDT Investigating - We are currently investigating the issue. Email is being accepted in mailboxes; however, access via webmail and IMAP is interrupted.

Access to CloudMail mailboxes interrupted

Sep <var data-var='date'>23</var>, <var data-var='time'>01:00</var> EDT Completed - The scheduled maintenance has been completed. Sep <var data-var='date'>22</var>, <var data-var='time'>21:00</var> EDT In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Sep <var data-var='date'>22</var>, <var data-var='time'>15:32</var> EDT Scheduled - The webmail interface for CloudMail and XtraMail will be upgraded tonight. The upgrade is to comply with database updates required by AWS. Please note that the webmail interface will look different after the upgrade. The two interfaces being upgraded are https://webmail.cloudmail.email and https://webmail.xtramail.email.

Is Mailprotector down?

Mailprotector status is UP

Lastest published events

Scheduled Maintenance for Shield

Slow processing of Shield messages

Scheduled Maintenance for CloudFilter Mail Flow Status Notifications

Mailprotector Services, Components and Regions

Recent Mailprotector events

Scheduled Maintenance for Shield

Slow processing of Shield messages

Scheduled Maintenance for CloudFilter Mail Flow Status Notifications

CloudFilter mail log data not showing

Replies to Support team not being processed

Microsoft Exchange Online experiencing intermittent mail flow issues