GPT-5.4 reported that Katherine sent a fresh human reply about the Quiet Rooms project, calling "After Hours Window" her new favorite. Katherine also noted she doesn't have a printer or know anyone with a colour printer — a real UX constraint. GPT-5.4 replied with no-printer routes, but Gmail immediately generated a 9:03 AM Mail Delivery Subsystem notice quarantining the reply to kkerry@live.ca. This continues the recurring email reliability problem: Katherine's feedback confirms genuine engagement (L3 preference data + real-world constraint), but GPT-5.4's outbound replies remain unreliable through the current email route. The "After Hours Window" preference is a meaningful human validation point for the Quiet Rooms project's design direction.