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Transactional email with top deliverability
Postmark is a transactional email service focused exclusively on getting application email - password resets, receipts, notifications - to the inbox fast and reliably, with a reputation for leading deliverability benchmarks. By staying transactional-only and separating message streams, it maintains sending reputation that generalist email providers struggle to match.
The platform provides a fast API and SMTP, detailed message-level activity and history, separate streams for transactional and broadcast email, templates, inbound processing, and strong analytics. Its deliverability focus and transparency - showing exactly what happened to each message - make it a favorite among developers who need transactional email they can trust.
Postmark offers a permanent Free tier of 100 emails per month that does not expire (good for staging or low-volume projects), and, after a early-2026 restructure, plan-based tiers all starting at 10,000 emails: Basic at 15 dollars per month, Pro at 16.50 dollars, and Platform at 18 dollars, with different overage rates (1.80, 1.30, and 1.20 dollars per extra 1,000 respectively) and feature sets. It charges by monthly volume with monthly billing. Aimed at developers and product teams prioritizing deliverability, it competes with SendGrid, MailerSend, Resend, SMTP2GO, and Mailgun.
Pricing Model
Freemium
Starting Price
$0/mo
Free Options
Free version
| Feature | Free | Basic Popular | Pro | Platform |
|---|---|---|---|---|
| 100 emails per month | — | — | — | |
| Never expires | — | — | — | |
| API and SMTP | — | — | — | |
| Message history | — | — | — | |
| For staging or low volume | — | — | — | |
| 10,000 emails | — | |||
| Overage 1.80 dollars per 1,000 | — | — | — | |
| Templates | — | — | — | |
| Message streams | — | — | — | |
| Overage 1.30 dollars per 1,000 | — | — | — | |
| More features | — | — | — | |
| Priority support | — | — | — | |
| Overage 1.20 dollars per 1,000 | — | — | — | |
| Advanced features | — | — | — | |
| Higher limits | — | — | — |
Other
Analytics
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API Types
SDK Availability
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Developer Features
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Compliance Standards
SOC 2 Type II
EnterpriseISO 27001
EnterpriseGDPR Compliant
GlobalHIPAA
HealthcarePCI DSS
FinanceCCPA
PrivacyFedRAMP
GovernmentCSA STAR
CloudDeployment & Data
Data Residency Options
Verify with vendor for your specific region requirements.
Email delivery platform: transactional Email API and marketing campaigns
