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.
State
Resolved
Started
Lasted
19 h 42 min
Worst impact
Degraded
Timeline
4 updatesIdentified
19 h 39 min 100%
Resolved
3 min 0%
Updates
Times in UTCAs posted by SendGrid
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.
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.
Affected components
10SendGrid in the last 90 days
Full historyIncidents in 90 days
75
Days with an incident
43
Median duration
9 h 1 min
This incident
2.2× the median
Other SendGrid incidents
All incidentsSendGrid·Degraded performance
SendGrid reports degraded performance on Mailsend Comms API, API v3, SMTP, and API v2. The incident started on 13 November 2026 at 15:24 UTC. SendGrid is investigating and gives no workaround.
SendGrid·Degraded performance
SendGrid reported degraded performance on Mailsend: Comms API, API v3, SMTP, and API v2. SendGrid reports that the incident is resolved. The incident lasted 3 minutes.
SendGrid·Email Template Editor Issues
SendGrid Marketing Campaigns had a problem with the email template editor. HTML entities changed to spaces, links changed, and some template content did not render after save or preview. SendGrid reports the incident resolved. It lasted 106 minutes.
SendGrid·Delayed Email Validation History
SendGrid reported delayed Email Validation history and statistics in the SendGrid UI. The Logs and TWILIO EMAIL - Logs components were degraded. SendGrid resolved the incident on 4 November 2026 after 168 minutes.
SendGrid·MMS Delivery Delays from a Subset of Twilio Long Codes to Multiple Small Carriers in United States
SendGrid reported MMS delivery delays from a subset of Twilio Long Codes to multiple small carriers in the United States. The affected components were MMS Long Code, North America. SendGrid resolved the incident after 78 minutes.
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