Transactional Email · decision tool
Cheapest email API at high volume
At hundreds of thousands of sends a month the cheapest provider is not the same as at 10k — per-send rates and included tiers reshuffle. Ranked live from verified pricing.
Prices verified 2026-07-15 against official pricing pages · fit weights are our estimates (see methodology) · share the URL to share your configuration
As of Jul 2026, with 500,000 emails/month, a $100 budget for this slot, Amazon SES ranks first for these inputs at 81% fit and a StackSays-estimated $50.00/month (SendGrid: 78% fit, $89.95/month). Fit weights are our estimates; prices trace to official pages. Change any input below and the verdict recomputes.
Your situation
The verdict updates as you move these.
Narrow pick — the runner-up is close
The price floor: $0.10 per 1,000 emails, bring your own dashboards
vs SendGrid: fit 81% against 78%, est $50.00 against $89.95 per month
The decision, in plain words
For a solo builder at 500,000 emails/month and a $100.00/mo budget for the email provider slot, Amazon SES leads at 81% fit and $50.00/mo. The two rules doing the work: budget fit (~$50/mo is 50% of your $100/mo budget); ecosystem maturity (established — our estimate from ecosystem age, docs and hiring pool).
SendGrid runs close (78% fit, $89.95/mo). It takes the lead if ~$89.95/mo is 90% of your $100/mo budget matters more to you than the current weights assume.
Honest weak spot of the pick: no free tier — paying from day one.
Generated from the calculation above — every number traces to the sourced data; nothing here is written by an AI making things up.
Why Amazon SES scores 81%
How the $50.00/mo estimate is calculated
What could change this verdict
Cost risk
Official prices verified 2026-07-15; calculation is deterministic code over those prices.
At a glance
| Tool | Free tier | Paid entry | Verified |
|---|---|---|---|
| Resend | 3,000 emails/month (100/day), 1 domain | Pro 50K $20/mo | 2026-07-15 |
| Postmark | 100 emails/month, full features | Basic $15/mo | 2026-07-15 |
| Amazon SES | No free tier | Pay-as-you-go — Flat $0.10/1K sent. Free tier is 3K/month for the first 12 months only — not permanent. Dedicated IP $24.95/mo optional | 2026-07-15 |
| Mailgun | 100 emails/day | Basic $15/mo | 2026-07-15 |
| SendGrid | No free tier | Essentials $19.95/mo | 2026-07-15 |
Data sources
| Tool | Source | Verified |
|---|---|---|
| Resend | Resend pricing page | 2026-07-15 |
| Postmark | Postmark pricing page | 2026-07-15 |
| Amazon SES | Amazon SES pricing page | 2026-07-15 |
| Mailgun | Mailgun pricing page | 2026-07-15 |
| SendGrid | Third-party 2026 pricing tracker (official page redirect-loops) | 2026-07-15 |
A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.