Postmark

API

Email delivery API for transactional and broadcast email

Price: Free tier, then paid
Access: Server token

About

Email delivery service for app email, with a REST API and SMTP. Transactional and broadcast mail go on separate message streams, and inbound mail arrives as JSON. The free developer plan sends 100 emails a month.

What you can do with it

Send transactional email from your app via REST API or SMTP
Send broadcast email on a separate message stream
Receive inbound email as JSON through a webhook

Get started

Verify a sender signature or domain
Copy the server API token

Example

curl "https://api.postmarkapp.com/email" \
  -X POST \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -H "X-Postmark-Server-Token: $POSTMARK_SERVER_TOKEN" \
  -d '{"From":"sender@example.com","To":"receiver@example.com","Subject":"Postmark test","TextBody":"Hello dear Postmark user.","MessageStream":"outbound"}'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Ruby, C#, Java, PHP
MCP server: Local