Mesh Security incident
Exchange Online is currently experiencing an incident that is delaying the delivery of email
Mesh Security experienced a minor incident on October 11, 2023 affecting Inbound Email Security and Inbound Email Security and 1 more component, lasting 20h 34m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- identified Oct 11, 2023, 11:43 AM UTC
Microsoft are currently experiencing an issue that is impacting delivery of email to customers using Exchange Online. Microsoft have posted about this incident on their service health dashboard. https://portal.office.com/Adminportal/Home#/servicehealth/:/alerts/EX680695 Affected users may see a "451 4.7.500 Server busy" error message." Emails are being deferred/queued and we will continue to retry delivery.
- resolved Oct 12, 2023, 08:17 AM UTC
Microsoft have resolved the issue and are continuing to monitor their changes. Start time: Monday, October 9, 2023 at 10:00 PM GMT+ End time: Wednesday, October 11, 2023 at 6:00 PM GMT+1 Most users would have experienced up to a 1-hour delay; however, in some cases, users may have encountered delays of up to 24 hours. The issue affected users worldwide and only for a portion of IP addresses, therefore not all users experienced impact.