rewindex

ChangesSparkPostMicrosoft outage: delays delivering to Outlook, Hotmail and Office 365

SparkPost: Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365

Incident updateNot classified yetChanged status.sparkpost.com (opens in new tab)
Summary

Summary pending. The diff below shows exactly what changed.

Incident page: the full timeline of updates

What changed

Struck in red is what SparkPost removed; blue is what they added. Muted text is unchanged context.

AddedUpdateidentified#1
Before: not present
After: Microsoft reports that the changes it applied to restore service are not working as expected, and it is pursuing other ways to add capacity. Delivery to Outlook.com, Hotmail, Live, MSN and Office 365 recipients remains significantly delayed, and about two-thirds of delivery attempts to Microsoft are still being deferred. Microsoft has not given an estimated time for recovery. The incident is tracked as EX1550543, and Microsoft's updates are at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost's systems are working normally. Messages still waiting for Microsoft remain queued and are being retried automatically. Please don't resend them, because that will create duplicates once they're delivered. The problem has now lasted nearly ten hours, so messages with expiration times of several hours or more may expire before Microsoft accepts them. Each expired message generates a bounce event, and since expired messages are no longer queued, you can decide whether to resend those.

Compared with the previous archived version of this incident (10 to 30-minute polling). View the live incident (opens in new tab).

Archive proof

Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert.

How the archive is checked, and what it cannot prove.

Rewindex captured this after the last checkpoint; the next run () commits it.

History of this incident

TodayFriday, November 13Fri, Nov 13

4 incident changes

YesterdayThursday, November 12Thu, Nov 12

2 incident changes

Cite this

Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365 on SparkPost’s status page, changed 2026-11-13 03:23 UTC (change 6 of 6).

Title
Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365
Vendor
SparkPost
Date
URL
https://rewindex.com/change/r4c3527cb8810d5

All SparkPost changesSparkPost profileMarkdownJSON