Managing personal Outlook.com account settings, security, and privacy
@matthew robinson said
let SPAM groups add my email without my consent? ... leave them as I am being added back
We all agree with you. This is a know issue. Microsoft is aware of the problem but there is currently no fix. Unfortunately the only thing any of us can do at this point is Vote for an Comment on this Feature Request, and hope that someone at Microsoft notices.
Add an option to block being added to Outlook Groups without consent
https://feedbackportal.microsoft.com/feedback/idea/a17de24f-8ce6-f011-92b9-7c1e5244b89c
(You must "Sign In" at the top right of the Feedback page before you can vote).