Postal
Self-hosted email delivery platform with powerful features for transactional and bulk emails, offering full control and customization.
16,723
MIT
Alternative to: Postmark
Best Open Source Postmark Alternatives
Transactional emails with exceptional speed and reliability, ensuring your application's critical messages reach users' inboxes every time.
Postmark8 tools
Open-source tools
Plunk
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
5,347
AGPL-3.0
Alternative to: Postmark
useSend
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.
4,199
AGPL-3.0
Alternative to: Postmark
Sendune
A comprehensive platform for managing transactional and marketing emails through AWS SES, featuring customer data management, SMS capabilities, and workflow automation.
2,094
MIT
Alternative to: Postmark
DoubleZero
00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.
1,246
AGPL-3.0
Alternative to: Postmark
Sessy
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
909
Other
Alternative to: Postmark
Hyvor Relay
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.
725
AGPL-3.0
Alternative to: Postmark
Wraps
Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.
55
Other
Alternative to: Postmark