Email Delivery Failures to Microsoft 365 Domains
Aug 17, 20:18 UTCAug 17, 20:18 UTC
Duration
0m
Impact
Informational
Root cause
Not disclosed
Mailgun, 90 days
11 incidents
Affected
Outbound DeliveryEmail Services - Outbound Delivery
Final update
We have received confirmation that an external issue impacting email delivery to Microsoft 365 domains has been resolved. Impacted messages would have received an error stating "5.7.511 Access denied, banned sender" between Friday, August 14th and Monday, August 17th. Any failed messages will need to be resent. Information on retrying messages can be found in our Help Center here: https://help.mailgun.com/hc/en-us/articles/18596982041883-Resending-messages
Timeline
- Resolved · Aug 17, 20:18 UTC
We have received confirmation that an external issue impacting email delivery to Microsoft 365 domains has been resolved. Impacted messages would have received an error stating "5.7.511 Access denied, banned sender" between Friday, August 14th and Monday, August 17th. Any failed messages will need to be resent. Information on retrying messages can be found in our Help Center here: https://help.mailgun.com/hc/en-us/articles/18596982041883-Resending-messages
More from Mailgun
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 1409:15 UTC | Route delays in EU Region | minor | 58m |
| Sep 414:16 UTC | EU Messaging Outage | critical | 17m |
| Sep 412:20 UTC | Microsoft Incident Resulting in Delivery Issues to M365 | none | 34m |
| Aug 3114:47 UTC | Event Log Delays in US Region | minor | 7h 14m |
| Aug 2720:38 UTC | EU Messaging Outage | critical | 37m |
| Aug 2016:19 UTC | GCP Reporting Multi Service Outage in US-West1 | minor | 1h 12m |
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