Occasion incident

Degraded e-mail deliverability for Microsoft 365

Major Resolved View vendor source →

Occasion experienced a major incident on August 14, 2026, lasting 2d 18h. The incident has been resolved; the full update timeline is below.

Started
Aug 14, 2026, 09:30 PM UTC
Resolved
Aug 17, 2026, 03:40 PM UTC
Duration
2d 18h
Detected by Pingoru
Aug 14, 2026, 09:30 PM UTC

Update timeline

  1. investigating Aug 16, 2026, 07:08 PM UTC

    We have received an elevated level of delivery failures to inboxes hosted by Microsoft 365. We suspect Microsoft has automatically blacklisted our emails and we are working with them on a solution. We believe that Microsoft has delisted us from their blacklist and normal operations should resume. We are awaiting confirmation from users.

  2. resolved Aug 17, 2026, 03:40 PM UTC

    Email delivery to Microsoft 365 and Outlook inboxes has returned to normal. If you experienced delayed or missing booking notification emails between August 14 and August 16, this should now be resolved.