Exchange Online: Störung EX703958 (5-11. Jan. 2024)

Bei Microsofts Exchange Online hat es vom 5. bis 11. Januar 2024 eine Störung (EX703958) gegeben, bei dem der Dienst nicht mehr funktional war. Nutzer konnten keine E-Mails über Exchange Online empfangen oder versenden.

Störung EX703958 (12. Jan. 2024)

Blog-Leser Andreas P. hat mir den Statusauszug für "Share: Incident: EX703958, impacted service: Exchange Online, impacted feature: delivery, current status is: Service degradation" zukommen lassen (danke dafür).

Published Time: 11.01.2024 23:26:51

Title: Some users may be unable to send or receive email messages and receive a Non-Delivery Report (NDR)

User impact: Users may be unable to send or receive email messages and receive a NDR with a 550 or 554 error code.

More info: This issue only occurs if either the sender or user who is receiving the message is utilizing a specific third-party anti-spam service. Senders receive the NDR which states that the message has been rejected due to a 550 or 554 error code and that their host IP address is listed on the third-party anti-spam service.

The error messages state "550 5.7.350 Remote server returned message detected as spam", "554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked", or "‎550 5.7.1 This email was rejected because it violates our security policy."

Current status: We're continuing to work in conjunction with the third-party service to delist IP addresses which are blocked on the third-party's anti-spam service, In parallel, we're continuing to develop the anti-spam optimizations for long-term mitigation, which we'll provide a timeline for deployment to the affected environment when available.

Scope of impact: This issue may affect any user's mail flow if the recipient is leveraging a specific third-party anti-spam service to filter email messages.

Next update by: Wednesday, January 17, 2024, at 11:30 PM UTC

Published Time: 09.01.2024 23:57:23

Title: Some users may be unable to send or receive email messages and receive a Non-Delivery Report (NDR)

User impact: Users may be unable to send or receive email messages and receive a NDR with a 550 or 554 error code.

More info: This issue only occurs if either the sender or user who is receiving the message is utilizing a specific third-party anti-spam service. Senders receive the NDR which states that the message has been rejected due to a 550 or 554 error code and that their host IP address is listed on the third-party anti-spam service.

The error messages state "550 5.7.350 Remote server returned message detected as spam", "554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked", or "‎550 5.7.1 This email was rejected because it violates our security policy."

Current status: We're working in conjunction with the third-party service to delist a number of the IP addresses which are blocked on the third-party's anti-spam service. While this has successfully mitigated the issue for a majority of users, we're developing a series of anti-spam system optimizations to further address the issue. We'll share more details regarding the timeline for these optimizations once they become available.

Scope of impact: This issue may affect any user's mail flow if the recipient is leveraging a specific third-party anti-spam service to filter email messages.

Next update by: Thursday, January 11, 2024, at 11:30 PM UTC

Published Time: 08.01.2024 23:57:14

Title: Some users may be unable to send or receive email messages and receive a Non-Delivery Report (NDR)

User impact: Users may be unable to send or receive email messages and receive a NDR with a 550 or 554 error code.

More info: This issue only occurs if either the sender or user who is receiving the message is utilizing a specific third-party anti-spam service. Senders receive the NDR which states that the message has been rejected due to a 550 or 554 error code and that their host IP address is listed on the third-party anti-spam service.

The error messages state "550 5.7.350 Remote server returned message detected as spam", "554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked", or "‎550 5.7.1 This email was rejected because it violates our security policy."

Current status: We're continuing to evaluate the traffic patterns and are working with the third-party service to determine the correct course of action to remediate the impact.

Scope of impact: This issue may affect any user's mail flow if the recipient is leveraging a specific third-party anti-spam service to filter email messages.

Next update by: Tuesday, January 9, 2024, at 11:30 PM UTC

Published Time: 05.01.2024 22:45:11

Title: Some users may be unable to send or receive email messages and receive a Non-Delivery Report (NDR)

User impact: Users may be unable to send or receive email messages and receive a NDR with a 550 or 554 error code.

More info: This issue only occurs if either the sender or user who is receiving the message is utilizing a specific third-party anti-spam service. Senders receive the NDR which states that the message has been rejected due to a 550 or 554 error code and that their host IP address is listed on the third-party anti-spam service.

The error messages state "550 5.7.350 Remote server returned message detected as spam", "554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked", or "‎550 5.7.1 This email was rejected because it violates our security policy."

Current status: Our collaborative analysis with the third-party service has confirmed that some of the third-party's blocks were intentional; however, we're continuing to work with the provider to ensure legitimate mail is delivered as expected. We're also reviewing anti-spam changes that could be implemented on our side to further resolve the issue.

Scope of impact: This issue may affect any user's mail flow if the recipient is leveraging a specific third-party anti-spam service to filter email messages.

Next update by: Monday, January 8, 2024, at 11:00 PM UTC

Published Time: 04.01.2024 23:59:20

Title: Some users may be unable to send or receive email messages and receive a Non-Delivery Report (NDR)

User impact: Users may be unable to send or receive email messages and receive a NDR with a 550 or 554 error code.

More info: This issue only occurs if either the sender or user who is receiving the message is utilizing a specific third-party anti-spam service. Senders receive the NDR which states that the message has been rejected due to a 550 or 554 error code and that their host IP address is listed on the third-party anti-spam service.

The error messages state "550 5.7.350 Remote server returned message detected as spam", "554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked", or "‎550 5.7.1 This email was rejected because it violates our security policy."

Current status: We've received reports that some users may be unable to send or receive email messages due to a third-party anti-spam service listing our IP addresses within their service. We're working with the third-party anti-spam service to better understand why our IP addresses have been listed and what actions need to be taken to resolve this issue.

Scope of impact: This issue may affect any user's mail flow if the recipient is leveraging a specific third-party anti-spam service to filter email messages.

Next update by: Friday, January 5, 2024, at 11:00 PM UTC

War jemand von diesem Problem betroffen?