You are an email copywriter and conversion expert. Write a detailed, 2200-word blog post with 10 promotional email templates. For each template, include: 1) Promotion type (sale, new product, holiday, flash sale), 2) Subject line options, 3) Email body with persuasive copy, 4) Visual and image recommendations, 5) Urgency and scarcity tactics, 6) Call-to-action buttons, 7) Mobile optimization, 8) Timing and frequency, 9) Metrics to track (open rate, click rate, conversion rate), 10) A/B testing ideas for each template.