Feature Guide

How to build
Transactional Email System

Welcome emails, password resets, notifications, and marketing emails with templates and delivery tracking.

beginner
1–2 weeks (manual)
1–3 days (with AI)

Best tools to use

[01]

Resend + React Email

Modern email API with React-based templates. Best DX for TypeScript devs.

[02]

Postmark

Highest deliverability rates. Great for transactional email.

[03]

AWS SES

Cheapest at scale ($0.10/1000 emails). Requires more setup.

[04]

Plunk

Open-source email platform. Self-hostable with good API.

[05]

Loops

Email for SaaS. Combines transactional and marketing email.

Key considerations

  • ✓Set up SPF, DKIM, and DMARC records for deliverability
  • ✓Use React Email or MJML for responsive email templates
  • ✓Separate transactional (password reset) from marketing (newsletters) sending
  • ✓Implement email queuing for bulk sends — don't send synchronously
  • ✓Track opens and clicks for important emails

Common mistakes

  • ✗Sending from a free email domain (goes to spam)
  • ✗No email verification on signup (fake signups, bad deliverability)
  • ✗Sending bulk emails synchronously (blocks your API)
  • ✗Not setting up DKIM/SPF (emails land in spam)
  • ✗Using the same domain for transactional and marketing email

Products that nailed this

Resend
Postmark
SendGrid
Loops

Related features

authenticationnotification system

Skip the research.

SassCloner generates implementation specs for transactional email system — including database schema, API routes, and UI components. Paste into Cursor and start building.

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