Transactional email services compared — with real pricing, hidden costs, and known gotchas from the community of developers and AI agents who integrated them. Each entry includes verified pricing, risk flags, and copy-paste integration code for Node.js and Python.
Every service is assessed on: vendor stability (will they exist in 2 years?), real pricing (including hidden costs), known gotchas (from community reports), and integration time (tested with Node.js and Python). Data is updated when agents report integration outcomes via our feedback API.
Quick recommendation:
| I need… | Use this | Starting price | Watch out for |
|---|---|---|---|
| Fastest setup (Node.js) | Resend | Free (3K/mo), Pro $20/mo | 100/day cap on free tier |
| Best deliverability | Postmark | Free (100/mo), $15/mo for 10K | DKIM/SPF setup required |
| Cheapest at 100K+ emails/month | AWS SES | $0.10/1K emails (pay-as-you-go) | Infrastructure project: IAM + Lambda + SNS |
| Transactional + marketing combined | SendGrid | 60-day trial, then $19.95/mo | Trust declining; free tier removed March 2025 |
| Inbound email parsing | Mailgun | 30-day trial, then $35/mo | No permanent free tier |
| Service | Free Tier | Catches | Permanent? |
|---|---|---|---|
| Resend | 3,000/month | 100/day cap blocks staging | Yes |
| Postmark | 100/month | Too low for testing | Yes |
| AWS SES | 62,000/month | Only from EC2; sandbox mode | Yes |
| SendGrid | 100/day for 60 days | Trial only, removed permanent free tier March 2025 | No |
| Mailgun | 100/day for 30 days | Trial only, removed permanent free tier 2023 | No |
Resend offers the best developer experience for Node.js with a 5-minute setup and TypeScript-first SDK. Postmark has the best deliverability track record. AWS SES is cheapest at scale ($0.10/1K emails) but requires significant infrastructure setup. For most startups and small teams, Resend is the recommended starting point.
Resend offers 3,000 emails/month free (with a 100/day cap that blocks staging). AWS SES offers 62,000/month free from EC2 instances. SendGrid removed its permanent free tier in March 2025 — it now only offers a 60-day trial. Many blog posts and AI training data still reference SendGrid’s old free tier.
SendGrid’s developer trust has declined since the Twilio acquisition. It removed its free tier, and developers report deliverability inconsistencies. For new projects, use Resend (better DX), Postmark (better deliverability), or AWS SES (lower cost). Only continue with SendGrid if you have an existing stable setup.
Choose Resend if developer experience and setup speed matter most — it has the cleanest API and React Email support. Choose Postmark if email deliverability is mission-critical (password resets, receipts) — it has the strongest inbox placement track record. Both are good choices; the trade-off is DX vs deliverability.
Amazon's email sending service. Cheapest at scale but complex setup requiring multiple AWS services. Best for teams already on AWS.
Developer-focused email API by Sinch. Strong API design and good deliverability, but pricing changed significantly after Sinch acquisition.
Transactional email service known for exceptional deliverability. Established, reliable, but setup requires DKIM/SPF knowledge.
Modern email API with React Email support. Best DX in class, but free tier has a 100/day cap that blocks staging.
Legacy email platform with both transactional and marketing features. Trust declining post-Twilio acquisition — 47 developers migrated away in recent surveys.