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Email Delivery Failures to Microsoft 365 Domains

Resolved incidentMinor1 affected service

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Every update Mailgun posted, oldest to newest, exactly as it appeared on their official status page.

  1. 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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