Cloudflare Worker + Resend email automation flows
Max 1 automated email per subscriber per 24 hours (transactional excluded). Welcome series suppresses all other flows. Abandoned checkout pauses abandoned cart. Sunset takes precedence over win-back.
Priority order (highest first):
1. Abandoned checkout 2. Abandoned cart 3. Welcome series 4. Post-purchase (cross-sell, feedback, review) 5. Educational drip 6. Win-back 7. Browse abandonment 8. Community (announcements, back-in-stock)