About
Postmark is an email delivery service that exposes both an Email API and SMTP service for sending transactional and broadcast email. The platform also includes inbound email processing, message streams, templates, webhooks, analytics, and official SDKs for common languages and frameworks.
The free developer tier includes 100 emails per month and never expires. It is intended for integration testing, deliverability evaluation, and low-volume side projects, while paid plans add higher monthly sending limits, more domains, longer retention, and inbound processing.
- 100 emails per month free
- REST API and SMTP sending
- Inbound email to JSON webhooks
- Official SDKs and libraries
- 45-day message retention on paid plans
- Separate message streams for mail types
What's included in the free tier
- 100 emails per month.
- No overages allowed on the free plan.
- Free developer tier never expires or runs out.
See Postmark pricing for current limits.
