The best onboarding sequences blend time-based and behavior-based triggers. Time-based emails fire on a schedule (Day 0, Day 1, Day 3) and ensure every user gets core messages. Behavior-based emails fire when users take or skip specific actions, making the sequence feel personal.
A strong sequence follows this arc: Welcome and quick win in the first 48 hours, feature education in days 3-7, social proof and milestone celebration in days 7-14, power user nudges for active users in days 14-21, and re-engagement plus conversion in days 21-30.
Each email should have exactly one job and one CTA. Do not try to teach three features in a single email. Keep bodies short (150-250 words), use the user's name, and reference their actual product activity when possible. The goal is to feel like a helpful colleague, not a marketing automation system.