About 22; min
Resend launched in 2023 with a simple pitch: “email for developers.” Amazon SES has been the budget option since 2011. Postmark built its reputation on deliverability. And SendGrid (Twilio) is the default that everyone knows. Four very different approaches to the same problem — sending transactional and marketing emails from your app.
We compared pricing at every volume to find which one gives you the most reliable delivery per dollar.
Quick Pricing Comparison
| Provider | Free Tier | 10K emails/mo | 100K emails/mo | 1M emails/mo |
|---|---|---|---|---|
| Amazon SES | 3,000/mo (from EC2) | $1.00 | $10.00 | $100 |
| Resend | 3,000/mo | $20 | $50 (Pro) | Custom |
| Postmark | 100/mo | $15 | $85 | $475 |
| SendGrid | 100/day (3K/mo) | $19.95 | $89.95 | $400+ |
Amazon SES is 5–20x cheaper than any competitor at every volume. The question is whether the cost savings justify the setup complexity and lack of built-in features.
Amazon SES: Cheapest by Far
SES charges $0.10 per 1,000 emails — flat, simple, no tiers. Sending 1 million emails costs $100. The same volume on SendGrid costs $400+, on Postmark costs $475. SES is 4–5x cheaper.
SES Setup Reality
The price comes with a trade-off: SES gives you the engine, not the car. You need to build:
- Bounce handling: Configure SNS topics to receive bounce and complaint notifications, then build logic to suppress those addresses
- Analytics: SES has basic open/click tracking but no dashboard. You build your own or use CloudWatch
- Template management: SES templates exist but the editor is minimal. Most teams use their own template system
- Deliverability monitoring: The Virtual Deliverability Manager ($100/month add-on) provides what Postmark and SendGrid include for free
For teams with a backend engineer who can spend 2–3 days on setup, SES saves thousands per year. For teams that want to send their first email in 15 minutes, it’s the wrong choice.
Resend: Developer Experience First
Resend’s pitch: the best developer experience with modern APIs, React Email integration (build email templates as React components), and clean documentation. Their free tier gives 3,000 emails/month — enough for a startup’s transactional emails through the first few months.
Resend’s Strengths
- React Email: Build email templates as React components with JSX. Preview in the browser, version control in Git. No more editing HTML tables in a web UI
- API design: The cleanest email API available. Send an email in 3 lines of code. SDKs for Node, Python, Go, Ruby, PHP, Elixir
- Webhooks: Real-time delivery, open, click, bounce, and complaint events. Included on all plans
- Speed: Email delivery in under 1 second for most recipients. Purpose-built infrastructure, not a legacy platform
Resend’s Limitations
- No marketing email features: Resend is transactional-only. No email builder, no subscriber lists, no campaigns. For marketing emails, you need a separate tool
- Younger platform: Launched in 2023, less proven at massive scale than SES or SendGrid. Deliverability reputation is still building
- Volume pricing: Pro at $20/month covers 50K emails. Above that, pricing isn’t publicly listed — you talk to sales. SES would cost $5 for the same 50K emails
Postmark: Best Deliverability
Postmark’s entire brand is built on deliverability. They only allow transactional email (no marketing/bulk), which keeps their IP reputation pristine. Postmark publishes real-time deliverability stats publicly — consistently showing 99%+ inbox placement rates across major providers.
Why Deliverability Matters Financially
A password reset email that lands in spam costs you a support ticket ($5–$15 to resolve). An order confirmation in spam costs customer trust and potential returns. If your transactional email deliverability drops from 99% to 95%, that’s 5,000 missed emails per 100K sent — potentially hundreds of support tickets and lost orders.
Postmark costs more than SES, but the deliverability difference can pay for itself in reduced support volume and higher customer satisfaction.
SendGrid: The Default Choice
SendGrid handles both transactional AND marketing email in one platform. If you need to send password resets AND newsletters from the same service, SendGrid is the only option on this list that does both (Resend and Postmark are transactional-only).
The Essentials plan at $19.95 for 50K emails is straightforward. Pro at $89.95 adds a dedicated IP — critical for maintaining deliverability at scale. Without a dedicated IP, your reputation is shared with other SendGrid customers on the same IP pool.
Cost at Scale
| Volume | SES | Resend | Postmark | SendGrid |
|---|---|---|---|---|
| 5K/mo | $0.50 | $0 (free) | $15 | $0 (free) |
| 50K/mo | $5 | $20 | $50 | $19.95 |
| 100K/mo | $10 | $50 | $85 | $89.95 |
| 500K/mo | $50 | Custom | $275 | $250+ |
| 1M/mo | $100 | Custom | $475 | $400+ |
SES saves $375/month vs Postmark and $300/month vs SendGrid at 1M emails. Over a year, that’s $3,600–$4,500 in savings. The question is whether your team’s time to set up and maintain SES costs more or less than that.
Feature Comparison
| Feature | SES | Resend | Postmark | SendGrid |
|---|---|---|---|---|
| Transactional email | Yes | Yes | Yes (exclusive) | Yes |
| Marketing email | Yes (DIY) | No | No | Yes |
| API quality | Functional | Best | Excellent | Good |
| React Email templates | No | Yes (native) | No | No |
| Dashboard/analytics | Minimal (CloudWatch) | Good | Excellent | Good |
| Deliverability | Good (you manage reputation) | Good (building) | Best (99%+ published) | Good (varies by IP pool) |
| Dedicated IP | $24.95/mo | Pro plan | $50/mo | Pro plan ($89.95) |
| Inbound email | Yes | Yes | Yes | Yes |
| Webhooks | SNS (requires setup) | Built-in | Built-in | Built-in |
| Setup time | 2–3 days | 15 minutes | 30 minutes | 30 minutes |
Who Should Pick What
Pick Amazon SES If:
- Cost is the top priority and you have engineering resources to handle setup
- You’re already on AWS and want to keep everything in one provider
- You send 500K+ emails/month where the per-email savings add up significantly
- You need both transactional and marketing email (build your own on top of SES)
Pick Resend If:
- Developer experience matters — you want the cleanest API and React Email templates
- You’re building a modern stack (Next.js, React) and want email templates in code
- Your volume is under 50K/month where Resend’s flat pricing is predictable
- You value speed of integration (15-minute setup) over cost savings
Pick Postmark If:
- Deliverability is your top priority — password resets, order confirmations, 2FA codes
- You only send transactional email (Postmark doesn’t allow marketing, keeping IP reputation clean)
- The cost premium ($85 vs $10 on SES for 100K emails) is justified by avoiding spam folder issues
- You want published deliverability metrics you can show your team
Pick SendGrid If:
- You need transactional AND marketing email from one provider
- Newsletter campaigns, drip sequences, and subscriber management are part of your workflow
- A/B testing for email subject lines and content matters
- You want a battle-tested platform with the largest user base
Cheapest: Amazon SES — $0.10/1,000 emails with no monthly minimum. 4–5x cheaper than any competitor at scale. Worth the setup effort for high-volume senders.
Best developer experience: Resend — React Email templates, the cleanest API, and 15-minute setup. The modern choice for developers building new applications.
Best deliverability: Postmark — 99%+ inbox placement with published metrics. The premium pays for itself in reduced support tickets and customer trust.
Best all-in-one: SendGrid — the only option handling both transactional and marketing email. Choose this if you need newsletters alongside password resets.
FAQ
Can I use SES with a nice dashboard?
Yes. Tools like Anymail (Rails), django-ses (Django), and SES Dashboard (open-source) add analytics on top of SES. You get SES pricing with a better dashboard experience, though it requires additional setup.
Does deliverability really vary between providers?
Yes. Shared IP pools (SendGrid Essentials, SES default) are affected by other senders’ behavior. Dedicated IPs (available on all providers for $25–$90/month) give you full control over your sending reputation. Postmark’s strict transactional-only policy means even their shared IPs have excellent reputation.
Can I switch email providers easily?
If you use SMTP, switching is a config change. If you use provider-specific APIs, you need to update your integration code. Libraries like Nodemailer (Node.js) abstract the provider, making switches easier. Budget 1–2 hours for SMTP-based switching, 1–2 days for API-based.
What about Mailgun?
Mailgun (now owned by Sinch) is a solid alternative at $0.80/1,000 emails on the pay-as-you-go plan. It sits between SES (cheaper) and Postmark (better deliverability). If none of the four options above fit perfectly, Mailgun is worth evaluating.
