Resend vs Postmark vs Amazon SES (2026)
Transactional emails (welcome, password reset, receipts) need high deliverability and fast delivery. Here's how the three main options compare.
Quick Comparison
| Feature | Resend | Postmark | Amazon SES |
|---|---|---|---|
| DX | ✅ Best | Good | Basic |
| Deliverability | Excellent | ✅ Best | Good |
| React Email | ✅ Native | ❌ | ❌ |
| Free Tier | 3K/month | 100 emails | 62K/month (from EC2) |
| Price (100K/mo) | $20 | $50 | $10 |
| Webhooks | ✅ | ✅ | ✅ (SNS) |
| Analytics | Basic | ✅ Excellent | Basic |
| Setup | 5 minutes | 10 minutes | 30+ minutes |
| Best For | Developers | Deliverability | High volume, low cost |
Resend — Best Developer Experience
import { Resend } from 'resend'
import { WelcomeEmail } from './emails/welcome'
const resend = new Resend(process.env.RESEND_API_KEY)
await resend.emails.send({
from: 'hello@yourapp.com',
to: 'user@example.com',
subject: 'Welcome!',
react: <WelcomeEmail name="John" />,
})
Pros: React Email integration (build emails as React components), cleanest API, fastest setup, good free tier. Cons: Newer platform, fewer analytics than Postmark, 3K free emails is limiting.
Postmark — Best Deliverability
const client = new postmark.ServerClient(process.env.POSTMARK_API_KEY)
await client.sendEmail({
From: 'hello@yourapp.com',
To: 'user@example.com',
Subject: 'Welcome!',
HtmlBody: '<h1>Welcome, John!</h1>',
MessageStream: 'outbound',
})
Pros: Industry-best deliverability (strict sending policies), excellent analytics (open/click tracking), message streams for organizing email types. Cons: More expensive, no React Email, 100 email free tier is tiny.
Amazon SES — Cheapest at Scale
import { SESv2Client, SendEmailCommand } from '@aws-sdk/client-sesv2'
const ses = new SESv2Client({ region: 'us-east-1' })
await ses.send(new SendEmailCommand({
FromEmailAddress: 'hello@yourapp.com',
Destination: { ToAddresses: ['user@example.com'] },
Content: {
Simple: {
Subject: { Data: 'Welcome!' },
Body: { Html: { Data: '<h1>Welcome!</h1>' } },
},
},
}))
Pros: Cheapest ($0.10 per 1,000 emails), 62K free from EC2, scales infinitely, full AWS integration. Cons: Worst DX, manual domain verification, basic analytics, no built-in templates, deliverability management is on you.
Pricing at Scale
| Volume | Resend | Postmark | SES |
|---|---|---|---|
| 10K/mo | Free | $10 | $1 |
| 50K/mo | $20 | $25 | $5 |
| 100K/mo | $20 | $50 | $10 |
| 500K/mo | $80 | $200 | $50 |
| 1M/mo | Custom | $375 | $100 |
SES is 5-10x cheaper. The question is whether the DX and deliverability trade-offs are worth it.
Decision Guide
| Need | Choose |
|---|---|
| Best DX + React Email | Resend |
| Maximum deliverability | Postmark |
| Cheapest at volume | Amazon SES |
| Fastest setup | Resend |
| Already on AWS | Amazon SES |
| Marketing + transactional | Postmark (message streams) |
FAQ
Does deliverability really differ?
Yes. Postmark has the highest inbox placement rates because they strictly prohibit marketing email, maintaining their IP reputation. SES requires you to manage your own reputation.
Can I use React Email with Postmark/SES?
Yes. Render React Email to HTML, then send via any provider. Resend just integrates natively.
Should I use SES directly or through Resend?
Resend uses SES under the hood. You're paying for the DX. If you're sending >500K/month and cost matters, use SES directly.
Bottom Line
Resend for the best DX and React Email integration. Postmark when deliverability is business-critical (password resets, financial notifications). Amazon SES for high volume and low cost. Start with Resend (3K free), upgrade to SES when volume demands cost optimization.