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Top Open Source Email Platforms Tools in 2026

A curated collection of the 7 best free and open-source Email Platforms tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • AgentMail

    Email inbox API for AI agents to create, send, and receive messages via REST

    Stars
    38
    Last commit
    19d ago
    License
    MIT

  • Plunk

    Open-source transactional email platform

    Stars
    5,397
    Last commit
    13d ago
    License
    AGPL-3.0

  • Sendportal

    Open source self-hosted email marketing

    Stars
    2,161
    Last commit
    29mo ago
    License
    MIT

  • Hyvor Relay

    Open-source email API for developers

    Stars
    877
    Last commit
    11d ago
    License
    AGPL-3.0

  • Keila

    Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.

    Stars
    2,192
    Last commit
    19d ago
    License
    AGPL-3.0

  • Freescout

    Open source Zendesk & Help Scout alternative

    Stars
    4,508
    Last commit
    13d ago
    License
    AGPL-3.0

  • DoubleZero

    00 is an open-source email API and infrastructure solution that allows developers to own and control their email stack.

    Stars
    1,249
    Last commit
    23mo ago
    License
    AGPL-3.0
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Showing 7 of 7 open-source tools