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: We're still monitoring the Microsoft incident (EX1550543). Delivery to Outlook.com, Hotmail, Live, MSN and Office 365 recipients is still heavily delayed, and we haven't seen a meaningful improvement yet. Microsoft says it has found a way to bring a test group of its affected servers back into service and is now rolling that fix out more widely. It is also restarting servers that stop responding. Delivery may improve gradually as that rollout continues, and Microsoft expects to post its next update by 22:30 UTC. You can follow it at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect. SparkPost is still queuing and retrying affected messages automatically, and some continue to get through on a retry. Please don't resend them. Messages with a short expiration time may still expire before Microsoft accepts them.

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. That proves these records existed by then and have not been changed since, by anyone, Rewindex included.

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

History of this incident

TodayFriday, November 13Fri, Nov 13

3 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 2026-11-12 21:43 UTC (change 1 of 5).

Title
Incident updated: Microsoft outage: delays delivering to Outlook, Hotmail and Office 365
Vendor
SparkPost
Date
URL
https://rewindex.com/change/r7506228251f9a0

All SparkPost changesSparkPost profileMarkdownJSON