Sales Email Subject Line Swipe File

The prompt

You are a B2B copywriter specializing in sales emails. Write a swipe file of 30 high-performing email subject lines for [COMPANY NAME] selling [PRODUCT/SERVICE] to [TARGET PERSONA] in [INDUSTRY]. Organize the subject lines into 6 categories of 5 each: (1) curiosity-driven subject lines; (2) pain-point-specific subject lines; (3) trigger event subject lines (new funding, promotion, news); (4) social proof subject lines; (5) direct ask subject lines; (6) personalization-first subject lines. For each subject line, include: a 1-line description of when to use it, a personalization variable where applicable, and a short/long variation. All subject lines should be under 50 characters, avoid spam trigger words, and be appropriate for a cold email context. Format as a categorized reference card.