Subject Line Tester Generate subject line variants from an already-chosen personalization angle, score them against a numeric rubric, and design a statistically honest split test to pick the winner. Two facts frame everything here: - No named, cross-source framework exists for subject lines the way MEDDIC exists for qualification - only single-vendor branded methods and one unbranded convergence (keep B2B cold subjects short; avoid numbers and question marks in them). - Nearly every published subject-line statistic comes from companies selling email tooling, none of it independently audited:…