Provider
MailgunIncident detail
Email Delivery Failures to Microsoft 365 Domains
Resolved incidentMinor1 affected service
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Timeline
Incident updates
Every update on the official status source, oldest to newest, exactly as it appeared there.
Resolved
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
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