Transactional Email APIs: pricing compared
5 providers · normalized per 1,000 emails · June 2026 snapshot
Transactional email APIs send password resets, receipts, alerts and other one-to-one messages. The fairest way to compare them is the normalized cost per 1,000 emails on each provider's entry-level paid tier, since free tiers and monthly minimums differ widely. On its headline metric, Amazon SES is generally the cheapest ($0.10 per 1,000 emails), but the best value depends on your volume and feature needs.
Source: Vendor published pricing pages. Data as of June 2026.
Transactional Email APIs compared
| Provider | Headline price | Free tier | Best for |
|---|---|---|---|
| Amazon SES | $0.10 per 1,000 emails | 62,000 emails/month free only when sending from an app hosted on Amazon EC2; otherwise no perpetual free tier. | High-volume senders who can manage their own deliverability, reputation and templating. |
| SendGrid | Essentials $19.95/month for 50,000 emails (~$0.40 per 1,000) | 100 emails/day free, forever. | Teams that want both transactional and marketing email under one roof with a generous free tier to start. |
| Resend | Pro $20/month for 50,000 emails ($0.40 per 1,000) | 3,000 emails/month free (100/day cap). | Modern dev teams that want a clean API, React Email templates and a quick start. |
| Mailgun | Basic ~$35/month for 50,000 emails (~$0.70 per 1,000) | Trial sends only; no perpetual free tier on current plans. | Developers who want a powerful email API with routing, inbound parsing and validation add-ons. |
| Postmark | $15 for 10,000 emails ($1.50 per 1,000) | 100 test/trial emails; no perpetual free tier. | Transactional email where speed and deliverability matter more than raw price. |
Vendor pricing as of June 2026 — verify on the vendor pricing page. We normalize each vendor's headline plan to a cost per 1,000 emails. Amazon SES is pure pay-as-you-go; the others bundle a monthly fee with an email allowance, so we divide the plan price by its included volume.
How we compare
We normalize each vendor's headline plan to a cost per 1,000 emails. Amazon SES is pure pay-as-you-go; the others bundle a monthly fee with an email allowance, so we divide the plan price by its included volume.
Provider notes
Amazon SES — $0.10 per 1,000 emails
Cheapest at scale by a wide margin, but it is infrastructure, not a product: you build your own analytics, suppression handling and templates. Inbound and dedicated IPs cost extra.
Free tier: 62,000 emails/month free only when sending from an app hosted on Amazon EC2; otherwise no perpetual free tier.
SendGrid — Essentials $19.95/month for 50,000 emails (~$0.40 per 1,000)
Now part of Twilio. The broad middle ground: cheaper than Postmark, more turnkey than SES. Shared-IP deliverability can vary on lower tiers.
Free tier: 100 emails/day free, forever.
Resend — Pro $20/month for 50,000 emails ($0.40 per 1,000)
A newer, developer-first option with a polished DX and the React Email library. Per-email price matches SendGrid Essentials.
Free tier: 3,000 emails/month free (100/day cap).
Mailgun — Basic ~$35/month for 50,000 emails (~$0.70 per 1,000)
Strong API and email-validation tooling. Per-email price sits between SendGrid and Postmark. Owned by Sinch.
Free tier: Trial sends only; no perpetual free tier on current plans.
Postmark — $15 for 10,000 emails ($1.50 per 1,000)
Among the most expensive per email, but known for fast delivery and strong transactional reputation. Separates transactional and broadcast streams.
Free tier: 100 test/trial emails; no perpetual free tier.
Head-to-head matchups
- SendGrid vs Amazon SES — cheaper on price: Amazon SES
- Postmark vs Mailgun — cheaper on price: Mailgun
Frequently asked questions
What is the cheapest email API in 2026?
Amazon SES is generally the cheapest email option on its headline metric ($0.10 per 1,000 emails). The best value depends on your volume and feature needs — We normalize each vendor's headline plan to a cost per 1,000 emails. Amazon SES is pure pay-as-you-go; the others bundle a monthly fee with an email allowance, so we divide the plan price by its included volume.
How do you compare email API pricing fairly?
We normalize each provider to a common unit (per 1,000 emails). We normalize each vendor's headline plan to a cost per 1,000 emails. Amazon SES is pure pay-as-you-go; the others bundle a monthly fee with an email allowance, so we divide the plan price by its included volume. Always confirm current pricing on the vendor's page, since rates change.
Source & accuracy
Each figure is a snapshot of the named vendor's public pricing page, captured in June 2026. Trademarks belong to their owners. API pricing changes frequently — verify on the vendor's pricing page before relying on these numbers. Derived figures are computed with the transparent formulas described in our methodology.
Last updated: 2026-06-18