Published Time: 11.10.2023 19:11:15
\nWe've completed development of an additional fix which is undergoing validation prior to deployment. We expect to complete this process within the next 60 minutes.
\nThis quick update is designed to give the latest information on this issue.<\/p>\n
Published Time: 11.10.2023 18:27:35
\nTitle: Some users may encounter delays receiving external email messages in Exchange Online
\nUser impact: Users may encounter delays receiving external email messages in Exchange Online.
\nMore info: Impact is specific to Simple Mail Transfer Protocol (SMTP), and users may encounter delays of up to 24 hours. Additionally, the email sender may receive a Non-Delivery Report (NDR) with a \"451 4.7.500 Server busy\" error message, and their attempt to retry delivery of the email may be delivered up to 24 hours later.
\nCurrent status: We've determined that our previous developed fix to resolve the throttling issue has proven to be unsuccessful. We're developing a new fix that will undergo internal validation to ensure it resolves the underlying issue before deploying it to the impacted environments.<\/p>\n
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
\nStart time: Monday, October 9, 2023, at 9:00 PM UTC
\nRoot cause: A recent service update, applied to a section of infrastructure responsible for enforcing IP address anti-spam rules, contains a change which is causing impact.
\nNext update by: Wednesday, October 11, 2023, at 6:30 PM UTC<\/p>\n
Published Time: 11.10.2023 12:26:01
\nTitle: Some users may encounter delays receiving external email messages in Exchange Online
\nUser impact: Users may encounter delays receiving external email messages in Exchange Online.
\nMore info: Affected users may see a \"451 4.7.500 Server busy\" error message.
\nCurrent status: We've identified that specific IP addresses are being unexpectedly limited by our anti-spam procedures, causing inbound external email delivery to become throttled and delayed. We're reviewing if there have been any recent changes to our anti-spam rules to understand why the IP addresses are being limited. In the meantime, we're manually adding reported affected IP addresses to an allowed list to provide immediate relief.
\nScope of impact: Impact is specific to some users who are served through the affected infrastructure.
\nNext update by: Wednesday, October 11, 2023, at 12:30 PM UTC<\/p>\n
Published Time: 11.10.2023 10:59:51
\nTitle: Some users may encounter delays receiving external email messages in Exchange Online
\nUser impact: Users may encounter delays receiving external email messages in Exchange Online.
\nMore info: Affected users may see a \"451 4.7.500 Server busy\" error message.
\nCurrent status: We're analyzing sample throttling IPs from simple messages to confirm whether the issue with the portion of SQL infrastructure is causing impact, before we begin formulating a remediation plan.
\nScope of impact: Impact is specific to some users who are served through the affected infrastructure.
\nNext update by: Wednesday, October 11, 2023, at 11:00 AM UTC<\/p>\n
Published Time: 11.10.2023 08:33:49
\nTitle: Users are unable to receive external email messages within Exchange Online
\nUser impact: Users are unable to receive external email messages within Exchange Online.
\nMore info: Some users email messages may send; however, users may experience delays up to one hour.
\nCurrent status: Our review of simple messages has lead us to a potential root cause where a portion of SQL infrastructure may be receiving an unusually large number of requests that may be hindering Exchange Online's performance. We're working to confirm our findings to cultivate further troubleshooting steps.
\nScope of impact: Your organization is impacted by this event, as well as users who are attempting to receive external email messages within Exchange Online.
\nNext update by: Wednesday, October 11, 2023, at 8:30 AM UTC<\/p>\n
Published Time: 11.10.2023 06:52:50
\nTitle: Users are unable to receive external email messages within Exchange Online
\nUser impact: Users are unable to receive external email messages within Exchange Online.
\nCurrent status: We're currently reviewing simple messages to refine our understanding of this specific impact scenario and establish our troubleshooting steps.
\nScope of impact: Your organization is impacted by this event, as well as users who are attempting to receive external email messages within Exchange Online.
\nNext update by: Wednesday, October 11, 2023, at 6:30 AM UTC<\/p>\n
Published Time: 11.10.2023 06:22:26
\nTitle: Users are unable to receive external email messages within Exchange Online
\nUser impact: Users are unable to receive external email messages within Exchange Online.
\nCurrent status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 30 minutes.<\/p><\/blockquote>\n
Microsoft has fallen victim to its anti-spam update. A recent service update for a part of the infrastructure responsible for enforcing anti-spam rules for IP addresses contained a change that caused this impact. The problem should now be fixed.<\/p>\n","protected":false},"excerpt":{"rendered":"
As of October 11, 2023, Exchange Online has experienced a severe mail traffic disruption. Several readers reported problems receiving emails from external email addresses. Microsoft has confirmed the incident and claims to have already rolled out a fix. Spoiler: They … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63,463],"tags":[2260],"class_list":["post-31936","post","type-post","status-publish","format-standard","hentry","category-cloud","category-issue","tag-exchange-online"],"_links":{"self":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/31936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/comments?post=31936"}],"version-history":[{"count":0,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/31936\/revisions"}],"wp:attachment":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/media?parent=31936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/categories?post=31936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/tags?post=31936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"Stop](\"https:\/\/www.borncity.com\/blog\/wp-content\/uploads\/2021\/06\/Stop01.jpg\" "\\"Stop")
As of October 11, 2023, Exchange Online has experienced a severe mail traffic disruption. Several readers reported problems receiving emails from external email addresses. Microsoft has confirmed the incident and claims to have already rolled out a fix. Spoiler: They fell victim to their own SPAM protection, which they rolled out on patchday.<\/p>\n![](\"https:\/\/www.borncity.com\/blog\/wp-content\/uploads\/2023\/10\/vQgY3Av.jpg\")
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