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Open Source Email Platforms using CSS

A curated collection of the best open source platforms for hosting your own email sending infrastructure. using CSS.

Plunk

The open-source, affordable email platform

  • Stars

    5,529

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.

Open Source Alternative to:

Resend

useSend

Pay per email sent, not for contact storage

  • Stars

    4,744

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.

Open Source Alternative to:

Resend

Sessy

Own your SES email analytics, from send to inbox

  • Stars

    942

  • Last commit

    6 days ago

  • License

    Unknown
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.

Open Source Alternative to:

Resend

Hyvor Relay

Open-source email API with enterprise deliverability

  • Stars

    918

  • Last commit

    5 days ago

  • License

    AGPL-3.0
Self-hosted email API alternative to AWS SES & Mailgun. Open-source AGPL-3.0 with enterprise features, automated deliverability, and cloud version coming 2026.

Open Source Alternative to:

Resend

Wraps

Code-first email platform that deploys to your AWS

  • Stars

    64

  • Last commit

    23 hours ago

  • License

    AGPL-3.0
Build email templates as React components and automations in TypeScript. Deploy to your AWS account with SES integration. Marketing teams edit content without code.

Open Source Alternative to:

Resend
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