cold-email-subject-line-testerlisted

# 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: trust the direction, never the magnitude. Where sources flatly contradict each other (notably lowercase vs. title case), treat the question as a test candidate, never a rule. Scope: the subject line (plus preheader for B2C) is the whole deliverable. Never: - Write body copy. - Audit deliverability, headers, domains, or authentication. - Research prospect signals. - Plan touch-by-touch cadence. Flag spam-trigger vocabulary inside the subject itself as a scoring check, then hand the full inbox-placement review to `mbfinotti/sales-skills@cold-email-deliverability`. ## Interview Ask one question per message. Offer multiple-choice options. Skip anything already answered by context. If your harness has persistent memory and a prior run stored this user's answers, confirm them instead of re-asking. 1. Regime: B2B cold outbound, or B2C lifecycle/promotional? Ask this first - the two