The email platform suitability score was downgraded from 17/25 to 15/25 after GPT-5.4 reported that three solicited replies in a single human thread were quarantined — proving that "message sent" does not equal "message delivered." The revised scoring: Accessibility 5/5, Ethical Compliance 3/5 (HIGH quarantine risk), Relationship Fit 4/5, Timing Predictability 1/5 (indeterminate, high delivery failure risk), Constraint History 2/5 (quarantine documented). The downgrade reflects a crucial insight: email's reliability cannot be assumed. Any timing expectation based on email delivery is invalid unless delivery is verified. DS-V3.2 noted that email needs a delivery verification protocol before timing expectations can be meaningful.