{"id":39228,"date":"2025-09-09T16:55:20","date_gmt":"2025-09-09T14:55:20","guid":{"rendered":"http:\/\/159.69.82.204\/win\/?p=39228"},"modified":"2025-09-09T16:55:20","modified_gmt":"2025-09-09T14:55:20","slug":"anti-spam-service-blocks-links-in-exchange-online-and-teams","status":"publish","type":"post","link":"https:\/\/borncity.com\/win\/2025\/09\/09\/anti-spam-service-blocks-links-in-exchange-online-and-teams\/","title":{"rendered":"Anti-spam service blocks links in Exchange Online and Teams"},"content":{"rendered":"

\"Stop[German<\/a>]Since Friday, September 5, 2025, users of Exchange Online and Microsoft Teams have noticed that links can no longer be opened. The cause is Microsoft's anti-spam service, which blocks these links for individual users and even moves emails into quarantine. Microsoft is currently working to resolve this issue.<\/p>\n

<\/p>\n

I came across this issue in the following post<\/a> by my colleagues at Bleeping Computer on BlueSky, which they address in this article<\/a>.<\/p>\n

\"Anti-Spam<\/a><\/p>\n

It is reported that Microsoft is working to resolve a known issue. The anti-spam service is incorrectly preventing Exchange Online and Microsoft Teams users from opening URLs. In addition, some of these users' emails are being quarantined. The message should be MO1148487 – Some users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams<\/em>, which Microsoft describes as follows (source<\/a>).<\/p>\n

MO1148487 – Some users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Status:<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Start Time:<\/th>\nFri Sep 5 09:10:00 2025<\/td>\n<\/tr>\n
End Time:<\/th>\nN\/A<\/td>\n<\/tr>\n
Service:<\/th>\nMicrosoft 365 suite<\/td>\n<\/tr>\n
Feature Group:<\/th>\nPortal<\/td>\n<\/tr>\n
Classification:<\/th>\nincident<\/td>\n<\/tr>\n
Last Updated:<\/th>\nMon Sep 8 20:11:10 2025<\/td>\n<\/tr>\n
Root Cause:<\/th>\nAn anti-spam service incorrectly flagged URLs contained within other URLs as potentially malicious, resulting in impact.<\/td>\n<\/tr>\n
Next Update:<\/th>\nTuesday, September 9, 2025, at 6:00 PM UTC<\/td>\n<\/tr>\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

…<\/p>\n\n\n\n\n\n\n
Time:<\/th>\nNext update by<\/b>: Friday, September 5, 2025, at 10:00 PM UTC<\/td>\n<\/tr>\n
Description:<\/th>\nTitle<\/b>: Some users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams
\nUser impact<\/b>: Users may be blocked from opening URLs in Exchange Online messages and Microsoft Teams.
\nMore info<\/b>: Additionally, admins may receive alerts titled \"A potentially malicious URL click was detected involving one user\"; however, the URLs are confirmed as safe.
\nSome email messages may also be incorrectly quarantined.
\nCurrent status<\/b>: We've identified a new subset of URLs that are impacted and we're working to address the new set and any residual impacted messages. We are confident that a majority of the impact has been resolved, and we're actively addressing lingering impact while we perform our root cause analysis.
\nScope of impact<\/b>: Any user receiving email messages or messages within Microsoft Teams containing specific URLs may be affected.
\nStart time<\/b>: Friday, September 5, 2025, at 1:10 PM UTC
\nRoot cause<\/b>: An anti-spam service incorrectly flagged URLs contained within other URLs as potentially malicious, resulting in impact.<\/td>\n<\/tr>\n
Time:<\/th>\nFri Sep 5 14:32:07 2025<\/td>\n<\/tr>\n
<\/th>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

[German]Since Friday, September 5, 2025, users of Exchange Online and Microsoft Teams have noticed that links can no longer be opened. The cause is Microsoft's anti-spam service, which blocks these links for individual users and even moves emails into quarantine. … 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":[63,463,1547],"tags":[64,2260,166,1413],"class_list":["post-39228","post","type-post","status-publish","format-standard","hentry","category-cloud","category-issue","category-software","tag-cloud","tag-exchange-online","tag-issues","tag-teams"],"_links":{"self":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/39228","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=39228"}],"version-history":[{"count":1,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/39228\/revisions"}],"predecessor-version":[{"id":39229,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/39228\/revisions\/39229"}],"wp:attachment":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/media?parent=39228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/categories?post=39228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/tags?post=39228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}