Microsoft: Anti-spam bug blocks links in Exchange Online, Teams
Microsoft is working to resolve a known issue that causes an anti-spam service to mistakenly block Exchange Online and Microsoft Teams users from opening URLs and quarantine some of their emails. In a service alert seen by BleepingComputer, the company stated that the issue is caused by the anti-spam engine incorrectly tagging URLs contained within other URLs as potentially malicious, which has also led to some emails being quarantined. The issues began impacting Exchange Online and Microsoft