Mailjet vs Postmark: developer API pricing compared
Updated 2026-11-10 · listed A to Z, not ranked
Mailjet, part of Sinch, offers email marketing and a transactional email API. Plans are priced by monthly email volume.
Postmark is a transactional email service. Its three paid plans start at 10,000 emails a month and differ by overage rate, retention and domains.
Listed A to Z, from mailjet.com and postmarkapp.com. Every figure below is quoted from those pages.
- Main price table
- Free, Starter, Essential, Premium
- Free option
- Free: $0
- Published prices
- Free 6,000 emails/month (200/day), Starter $9/month, Essential $19/month, Premium $29/month. Annual billing saves 10%.
- Main price table
- Free, Basic, Pro, Platform
- Free option
- Free: $0 (100 emails a month)
- Published prices
- Free 100 emails a month, Basic $15, Pro $16.50 and Platform $18 for 10,000 emails, overage per 1,000 and retention.
How we checked: Prices quoted from each official pricing page: Mailjet checked Nov 10, 2026, Postmark checked Nov 10, 2026. Taxes, usage overages and promotions can change what you pay; confirm with each provider before you buy.
How they compare
- Main price table. Mailjet lists 4 entries (Free, Starter, Essential, Premium); Postmark lists 4 (Free, Basic, Pro, Platform).
- Lowest listed paid tier. Mailjet: Starter $9/mo. Postmark: Basic $15, price per month. Billing terms differ (per user or flat, monthly or annual), so check what each tier includes below.
- Free option. Mailjet: Free: $0. Postmark: Free: $0 (100 emails a month).
- How prices are quoted. Mailjet: “Plans (monthly billing)”. Postmark: “Plans (10,000 emails a month)”.
Mailjet plans and prices
| Plan | Price | Includes |
|---|---|---|
| Free | $0 | 6,000 emails per month, 200 per day, 1,000 contacts |
| Starter | $9/month | 8,000 emails per month |
| Essential | $19/month | 15,000 emails per month, unlimited contacts |
| Premium | $29/month | 15,000 emails per month plus automations |
Prices at the volume shown on the page. Mailjet says annual billing saves 10%.
From mailjet.com, checked Nov 10, 2026. Full breakdown: Mailjet pricing.
Postmark plans and prices
| Plan | Price per month | Extra per 1,000 | Includes |
|---|---|---|---|
| Free | $0 (100 emails a month) | No overage | |
| Basic | $15 | $1.80 | 45-day retention, 5 domains |
| Pro | $16.50 | $1.30 | Retention up to 365 days, 10 domains, inbound |
| Platform | $18 | $1.20 | Unlimited domains, inbound |
From postmarkapp.com, checked Nov 10, 2026. Full breakdown: Postmark pricing.
FAQ
How much does Mailjet cost?
Free 6,000 emails/month (200/day), Starter $9/month, Essential $19/month, Premium $29/month. Annual billing saves 10%. (checked Nov 10, 2026).
How much does Postmark cost?
Free 100 emails a month, Basic $15, Pro $16.50 and Platform $18 for 10,000 emails, overage per 1,000 and retention. (checked Nov 10, 2026).
Do Mailjet and Postmark have a free option?
Mailjet: Free: $0. Postmark: Free: $0 (100 emails a month).
What is the cheapest paid plan, Mailjet or Postmark?
Lowest listed paid tier: Mailjet Starter $9/mo; Postmark Basic $15, price per month (as quoted on each pricing page). Billing units differ, so compare what each includes.
Which is better, Mailjet or Postmark?
We do not pick a winner. The two price and package their products differently; the tables above quote each official pricing page so you can match a plan to your own usage.
Where do these prices come from?
Each vendor's own pricing page: mailjet.com (checked Nov 10, 2026) and postmarkapp.com (checked Nov 10, 2026). Prices change; confirm on the vendor's page before you buy.
Sources (official pages, read 2026-11-10)
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