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Open Source Email Platforms using GitHub

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

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Hyvor Relay

Open-source email API with enterprise deliverability

  • Stars

    910

  • Last commit

    4 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:

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Resend
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AgentMail

AI
Email inbox API built for AI agents and workflows

  • Stars

    40

  • Last commit

    3 days ago

  • License

    MIT
Provides AI agents with real email inboxes via REST API. Create inboxes instantly, send and receive messages, search threads, and handle attachments programmatically.
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