Resolved after 7 hours 7 minutes, on May 25, 2016.
Microsoft has reported that this issue is resolved. Mail should flow normally now to Microsoft domains.
Update timeline
- identified May 25, 2016, 08:32 PM UTC
Microsoft email domains currently appear to be deferring all mail sent to them. This includes and is not limited to the following email domains @Hotmail, @Microsoft, @Outlook. This issue is not a TeamSideline issue. We will continue to retry sending email to the Microsoft email domains for up to 72 hours.
- resolved May 26, 2016, 03:40 AM UTC
Microsoft has reported that this issue is resolved. Mail should flow normally now to Microsoft domains.
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