Email has two jobs. Transactional email confirms an action: welcome after sign-up, receipt after payment, reset password. Marketing email follows up: onboarding sequence, new feature announcement, re-engagement.
Keep deliverability high by sending from a domain you own, setting SPF, DKIM and DMARC, and keeping your list clean. A beautiful email that lands in spam is useless.
Email sequence prompt
Design an onboarding email sequence of 3 emails sent 1 hour, 1 day and 3 days after sign-up. Each email has one clear action. Include unsubscribe and a plain-text fallback.