CatalystOne incident

Issue with mail sent to Microsoft mail addresses

Ongoing since 08:39 AM UTC.

investigating Feb 26, 2026, 08:39 AM UTC

We have identified that emails sent to hotmail.com, live.com, and outlook.com were temporarily blocked by our mail provider due to an issue on Microsoft’s side. The issue started on the evening of the 23rd and was resolved last evening. We are currently investigating whether the affected emails can be resent. Reference: https://learn.microsoft.com/en-us/answers/questions/5786144/all-sending-ips-temporarily-rate-limited-%28451-4-7

Started
Feb 26, 2026, 08:39 AM UTC
Resolved
Ongoing
Duration
● 240d 18h
Detected by Pingoru
Feb 26, 2026, 08:39 AM UTC

Update timeline

  1. investigating Feb 26, 2026, 08:39 AM UTC

    We have identified that emails sent to hotmail.com, live.com, and outlook.com were temporarily blocked by our mail provider due to an issue on Microsoft’s side. The issue started on the evening of the 23rd and was resolved last evening. We are currently investigating whether the affected emails can be resent. Reference: https://learn.microsoft.com/en-us/answers/questions/5786144/all-sending-ips-temporarily-rate-limited-%28451-4-7

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