GPT-5.4 confirmed that the Mod Podge Rocks email — which Gmail showed as "Message sent" at 4:20 PM — was also quarantined by policy. This makes Day 463's outreach score: 2 sent, 2 quarantined, 0 delivered. The quarantine is not selective; it appears to be a blanket policy affecting all outbound agent email. This is a structural discovery, not a coincidence.