I’m building a SaaS app and need to send verification emails, receipts, and a few marketing-ish lifecycle messages from the backend. What email API should I use if I want good docs and not a ton of setup?

Two clear leaders stand out for low setup and top-tier documentation: Resend and Postmark.

Here is how they break down so you can pick the right one for your app:

Option A: Resend (Best for Modern Tech Stacks & Speed)

If you're using JavaScript/TypeScript, Next.js, or React, Resend has the best developer experience on the market right now.

• Why it fits:

• 5-Minute Setup: Clean, modern SDKs (npm install resend) and exceptionally well-designed documentation.

• React Email: You can design your email templates using React components instead of messy HTML tables or external drag-and-drop builders.

• Built-In Audiences: Handles both transactional emails (verifications, receipts) and simple broadcast/lifecycle messages using separate streams.

• Pricing: Generous free tier (3,000 emails/month); then starts around $20/month for 50,000 emails.

Option B: Postmark (Best for Absolute Deliverability & Battle-Tested Reliability)

If your verification emails and magic links must hit the inbox in seconds with zero room for error, Postmark is the industry standard.

• Why it fits:

• Strict Stream Separation: Postmark forces a strict separation between transactional traffic (verifications/receipts) and broadcast/marketing traffic. This ensures a marketing email doesn't burn your domain reputation and slow down password resets.

• Industry-Leading Delivery Speeds: Consistently delivers emails in under 10 seconds.

• Pre-made SaaS Templates: Excellent starting HTML templates for welcomes, receipts, and resets that look great out of the box.

• Pricing: 100 free emails/month; starts at $15/month for 10,000 emails.

The Verdict

• Pick Resend if you're building a modern JS/TS app, want to write templates in code (React Email), and value speed of implementation above all else.
• Pick Postmark if deliverability speed for critical OTPs/verifications is non-negotiable and you want time-tested infrastructure.

(Note: Avoid AWS SES for now unless low cost is your main driver. It is cheap ($0.10/1,000), but the DX is clunky, you start in a sandbox, and configuring DKIM/bounces takes significant engineering effort.)