Microsoft disables bad spam rule flagging all sent emails as junkMicrosoft has disabled a bad anti-spam rule flooding Microsoft 365 admins' inboxes with blind carbon copies (BCC) of outbound emails mistakenly flagged as spam. [...]
Source: Microsoft disables bad spam rule flagging all sent emails as junk (https://www.bleepingcomputer.com/news/microsoft/microsoft-disables-bad-spam-rule-flagging-all-sent-emails-as-junk/)