Update - There isn't much to report (https://status.cloud.microsoft/m365/). Hotmail is easing, but Office 365 is still in bad shape, turning away hundreds of thousands of emails. We will continue monitoring and will update this status when there's news.
Nov 12, 2026 - 17:55 EST
Nov 12, 2026 - 17:55 EST
Update - A small update. New mail is mostly getting through, while messages already held earlier keep being retried and turned away. Hotmail messages are bouncing at a 5x rate than normal, but Letterhead won't treat those as cleaned, so you're not at risk of losing subscribers.
Nov 12, 2026 - 16:00 EST
Nov 12, 2026 - 16:00 EST
Monitoring - Microsoft is currently experiencing a service disruption affecting Outlook, Hotmail, and Microsoft 365. Since about 1:00 PM ET today, Microsoft’s mail servers have been temporarily declining new messages, so newsletters sent to those addresses may arrive later than usual.
Your sends are not lost. Messages to Microsoft addresses are queued and retried automatically, and they’ll be delivered as Microsoft’s service recovers. Delivery to Gmail, Yahoo, Apple, and other providers is not affected.
You don’t need to resend or reschedule anything. Open rates for Microsoft recipients on today’s sends may look low until the delayed messages arrive.
We’ll update this notice as Microsoft’s service recovers.
Nov 12, 2026 - 15:13 EST
Your sends are not lost. Messages to Microsoft addresses are queued and retried automatically, and they’ll be delivered as Microsoft’s service recovers. Delivery to Gmail, Yahoo, Apple, and other providers is not affected.
You don’t need to resend or reschedule anything. Open rates for Microsoft recipients on today’s sends may look low until the delayed messages arrive.
We’ll update this notice as Microsoft’s service recovers.
Nov 12, 2026 - 15:13 EST
API
Operational
Curations API
Operational
Marketing API
Operational
Applications
Operational
Agents
Operational
Archives
Operational
Audience
Operational
Composer
Operational
Curations Dashboard
Operational
Dashboards
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Newsletters
Operational
Polls
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Promotions
Operational
Letterhead for Chrome
Operational
Delivery
Degraded Performance
Outbound Email Deliverability (Shared Pools)
Degraded Performance
Outbound Email Deliverability (Dedicated Pools)
Degraded Performance
Integrations
Operational
Mailchimp
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WordPress
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Email Service Provider
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Link Resolution and Enrichment
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Metrics
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Notifications
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Transactional Emails
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Webhooks
Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.