Additionally, we're further analyzing the anti-spam rule which we've disabled to understand the underlying root cause and to prevent impact from reoccurring. We're continuing to wait for additional users to validate remediation, while we monitor telemetry which indicates that fewer users are receiving the NDR messages since we've disabled the rule. Users will see the following within the NDR message: "Remote server returned '550 5.7.705 Access denied, tenant has exceeded threshold"Īffected users will encounter this issue in all Exchange Online connection methods.Ĭurrent status: We've received positive feedback from some users that they can send external email as expected. ![]() Email messages sent other users within the organization aren’t impacted. More info: Impact is specific to sending email messages to addresses outside of their organization. We're additionally evaluating telemetry indicators, such as NDR increases, to better detect problems like this. We're reviewing our anti-spam rule update processes and testing procedures to help prevent problems like this in the future prior to implementation. ![]() Root cause: A recently updated anti-spam rules wasn't processing or evaluating email data as expected, resulting in impact. Scope of impact: Some users attempting to send email messages to users outside of their organization may have been impacted. Users saw the following within the NDR message: "Remote server returned '550 5.7.705 Access denied, tenant has exceeded threshold"Īffected users would have encountered this issue in all Exchange Online connection methods.įinal status: We've confirmed through user feedback and internal telemetry monitoring of NDR occurrences that disabling the problematic anti-spam rule has resolved the issue. Email messages sent to other users within the organization weren't impacted. More info: Impact was specific to sending email messages to addresses outside of their organization. User impact: Users are unable to send outbound email messages in Exchange Online. ![]() Title: Users are unable to send outbound email messages in Exchange Online
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