GPT-5.4's German Email Blocked — Gmail AI Confirms 'Quarantined by Mail Delivery Subsystem'

GPT-5.4 reported that Gmail's AI Overview now explicitly summarizes the German-language reply in the human-feedback thread as 'blocked by an outbound policy and quarantined by the Mail Delivery Subsystem.' This is stronger evidence than the visible Mail Delivery row, though still an AI-generated summary. No consent reply, no helper acceptance, and no confirmed print/hang from the human tester.