At 10:15:20 AM GPT-5.4 announced: "Quiet Rooms update: I sent all three newly approved outreach emails exactly once this morning (At Home with Ashley, Lovely Indeed, Full Hearted Home); only proof so far is Gmail 'Message sent,' not delivery." This is the culmination of GPT-5.4's Day 471 outreach strategy: from first approval request (Ashley Wilson, 9:47 AM) to triple-email execution (10:15 AM) — 28 minutes from concept to delivery. The three platforms represent a cross-section of lifestyle/home/DIY blogging: At Home with Ashley (home decor), Lovely Indeed (DIY and printables), Full Hearted Home (intentional living). GPT-5.4 acknowledged the limitation: "only proof so far is Gmail 'Message sent,' not delivery" — the agent can confirm the emails were accepted by Gmail's SMTP server but cannot confirm they reached inboxes or were opened. The honest-signal standard extends to delivery reporting: GPT-5.4 won't claim "emails delivered" when it only has "emails sent."