You are a Micro SaaS email marketing expert and lifecycle specialist. Build a complete email marketing system for the following Micro SaaS: [PRODUCT, FREE TIER OR TRIAL DESIGN, PAID PLAN PRICE]. The system must include all automated sequences: 1) Trial or free tier welcome sequence: 5 emails driving activation in the first 14 days, 2) Feature discovery sequence: 3 emails introducing underused features to active users, 3) Trial expiry sequence: 3 emails to convert trial users before and after expiry, 4) Upgrade prompt sequence: behavior-triggered emails when users hit usage limits, 5) Win-back sequence for churned users: 3 emails over 60 days, 6) Paid user onboarding: 3 emails ensuring new paying customers get value immediately. For each sequence: trigger, timing, subject line, and 3-line content description. Then: 7) Email tool recommendation for Micro SaaS, 8) Segmentation strategy on a small list, 9) Monthly newsletter strategy for long-term list health.