Microsoft Defender for Office 365 will introduce message warnings in Microsoft Teams for messages containing URLs flagged as Spam, Phish, or Malware. Starting with a public preview in September 2025 and general availability in November 2025, warnings will appear for both recipients and senders, enabled by default and manageable via Teams Admin Center.
Applies to: Microsoft Defender XDR
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).