Omega Systems Alert about O365 Exchange Online

Resolved Update from Microsoft: Title: Some users are unable to send or receive email messages within Exchange Online

User Impact: Users may have experienced delays or been unable to send or receive email messages within the Exchange Online service.

More info: Some users may have received the error message '451 4.3.2 Temporary server error. Please try again later ATTR1' if they attempted to email an impacted organization.

Final status: We've monitored the environment and confirmed that the queued emails have processed as expected.

Scope of impact: Impact was specific to organizations hosted from infrastructure located in North America. However, if a user not hosted on the affected infrastructure attempted to send an email to a user within an impacted organization, they may have been unable to send the email.

Start time: Thursday, April 22, 2021, 9:00 AM (1:00 PM UTC) End time: Thursday, April 22, 2021, 12:30 PM (4:30 PM UTC)

Preliminary root cause: Our preliminary investigation determined impact was caused by a load balancing configuration issue. This behavior occurred when a specific type of call happened when inbound mail was received. Under normal circumstances this type of call would be routed to the Data Center cache, but in this instance, the call was also being sent directly to the database, causing a conflict and resulting in a spike resource utilization. Next steps: - We're analyzing performance data and trends on the affected systems to help prevent this problem from happening again. We'll publish a preliminary Post-Incident Report (PIR) within two business days and a final PIR within five business days.

O365 Issue - This will be affecting any customers using O365 for Email functions. This may not include you but be aware that some other companies you are emailing with could be having this issue.

Omega Systems has identified an issue impacting the functionality Microsoft's O365 Mail service.

Latest update from Microsoft:

Title: Some users are unable to send or receive email messages within Exchange Online

User Impact: Users may be unable to send or receive email messages within the Exchange Online service.

Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix.

Scope of impact: Impact is specific to users who are hosted out of the affected infrastructure in North America.

Next update by: Thursday, April 22, 2021, 12:00 PM (4:00 PM UTC)

If you have any questions, please email us at servicedesk@omegapa.com or if your issue requires immediate assistance please call us at 484.772.1110.

Thank you,

OMEGA SYSTEMS Office 610.678.7002 | Service Desk 484.772.1110

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