Google Groups spam massages issue escalated for further investigation

Google Groups users are complaining that they are getting thousands of spam text messages and are unable to block them.

Identify Google Groups vulnerable to spam and spoofing

Using the Teams Report a Concern Option for Chat Messages

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How to get my internal emails to stop getting classified as spam? - Google Workspace Admin Community

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How do I disable or unsubscribe from Google groups spam notifications - Google Workspace Admin Community

Identify Google Groups vulnerable to spam and spoofing

Free G Suite]: How to fix rejection of email due to spam classification to group support@xyz.com? - Google Workspace Admin Community

SubStop: An analysis on subscription email bombing attack and machine learning based mitigation - ScienceDirect