# SendGrid: Email Delivery Delays to Microsoft Inboxes

> SendGrid reported delayed email delivery to Microsoft inboxes. The problem affected the Comms API, API v3, SMTP, and API v2. SendGrid identified the issue and later marked it resolved. The outage lasted about 19 hours and 42 minutes.

- Provider: [SendGrid](https://outages.live/sendgrid.md)
- Type: Incident
- State: Resolved
- Worst impact: Degraded performance
- Started: 2026-11-12 19:42 UTC
- Resolved: 2026-11-13 15:24 UTC (lasted 19 h 42 min)
- Components: Mailsend: Comms API, API v3, SMTP, API v2, Other, TWILIO PLATFORM - Other, TWILIO EMAIL - Mailsend: Comms API, SendGrid Mail Sending - API v3, SendGrid Mail Sending - SMTP, SendGrid Mail Sending - API v2
- Official update: https://stspg.io/6f5v3h5q1mkr

## Updates from SendGrid

### resolved, 2026-11-13 15:24 UTC

No text.

### identified, 2026-11-13 15:21 UTC

We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though we are seeing continued improvement as queued messages are retried automatically and delivery progresses toward normal levels. No action is required from customers at this time. We will provide another update in 2 hours or as soon as more information becomes available.

### resolved, 2026-11-13 15:18 UTC

No text.

### identified, 2026-11-13 14:42 UTC

We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though we are seeing continued improvement as queued messages are retried automatically and delivery progresses toward normal levels. No action is required from customers at this time. We will provide another update in 2 hours or as soon as more information becomes available.