Microsoft says it partially mitigated a week-long Change On-line outage inflicting delays or failures when sending or receiving e mail messages.
Whereas the corporate did not publicly share info on this incident, it tagged it as a vital service situation tracked beneath EX1027675 on the Microsoft 365 Admin Heart.
Microsoft has but to share extra info on what areas had been affected by this outage, nevertheless it mentioned the incident impacted “any person serviced by the impacted portion of infrastructure.”
Prospects worldwide additionally reported experiencing e mail supply failures over the final week, with these impacted saying they had been receiving a Non-Supply Report (NDR) with a “554 5.6.0 Corrupt message content material” error.
The corporate first acknowledged the Change On-line e mail supply points on March 10, 11:14 AM, however the admin heart incident report says the outage began on March 7, 12:30 PM UTC.
“A current service replace, supposed to enhance our message transport providers, launched a code situation that resulted in impression for a portion of service infrastructure,” Redmond mentioned within the closing replace relating to this incident on Thursday.
“Moreover, customers could also be unable to ship e mail messages with hooked up recordsdata in any connection technique of Change On-line. Sending attachments as ZIP recordsdata permits the e-mail messages to be delivered as anticipated, serving as a technique by which to bypass the problem whereas we proceed to research.”
Comparable situation nonetheless inflicting e mail supply failures
Microsoft continues to trace a separate incident with an almost an identical impression beneath EX1030895 after efficiently mitigating EX1027675 with a repair that rolled out Wednesday morning.
This second incident continues to be ongoing, with the corporate saying it is “restricted to a small subset of messages” that set off NDR failures and intermittent plain textual content calendar invite emails with winmail.dat attachments.
Though it’s nonetheless engaged on discovering the foundation trigger of those e mail supply failures, Redmond says it is testing a possible repair deployed on an remoted part of its infrastructure.
“We’re conducting a number of focused restarts of machines containing the repair to make sure the anticipated aid is achieved,” Microsoft mentioned earlier at the moment. “Moreover, we’re carefully monitoring our diagnostic telemetry knowledge to isolate the foundation explanation for the problem, and we’re reviewing the general service well being throughout this course of.”
Two weeks in the past, the corporate linked a weekend Microsoft 365 outage affecting Outlook and Change On-line authentication to a different “code situation.” A subsequent advisory revealed that Change On-line customers nonetheless had points accessing calendars and e mail messages utilizing the iOS native mail app.
Days later, it mitigated yet another Microsoft 365 outage affecting Groups clients and inflicting name failures.
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