GStars
    Billionmail

    Billionmail/BillionMail

    BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr

    backend
    dovecot
    email
    email-marketing
    mail
    mailserver
    Go
    AGPL-3.0
    16.2K stars
    1.8K forks
    66 GitHub watchers
    Updated Nov 7, 2026
    View on GitHub

    Build with Backblaze B2

    SDKs, agent skills, IDE extensions, and reference pipelines from Backblaze Labs. All open source.

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    Where it stands

    Rank, growth pace and release cadence relative to everything GStars tracks.

    No releases in the last 90 days; the most recent was 330 days ago, with 15 contributors on GitHub.

    Peaked at #22 in the weekly ranking the week of Sep 14, its best in the past year.

    Use Cases & Benefits

    • Provides a fully self-hosted open-source mail server and email marketing platform for managing campaigns and newsletters.
    • Eliminates monthly fees and vendor lock-in by offering unlimited sending with advanced analytics and full control over data.
    • Use for deploying a private email marketing system to send newsletters and promotional emails without third-party services.
    • Use for integrating a customizable mail server with built-in WebMail access and email tracking for business communications.
    • Use for developers and businesses seeking a privacy-first, scalable email platform that supports domain verification and SSL.

    Should you depend on it?

    License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.

    License

    AGPL 3.0

    Network copyleft: like the GPL, and also triggered by offering the software over a network.

    Community files

    • README: present

    Watch-outs

    • AGPL-style copyleft also applies when the software is offered over a network.

    General guidance from repository metadata, not legal advice. How we score

    From the README

    BillionMail is a future open-source Mail server, Email marketing platform designed to help businesses and individuals manage their email campaigns with ease. Whether you're sending newsletters, promotional emails, or transactional messages, this tool will provide full control over your email marketing efforts. With features like advanced analytics, and customer management, you'll be able to create, send, and track emails like a pro.

    Billion emails. Any business. Guaranteed.

    ✅ It takes only 8️⃣ minutes from installation to ✅ successful email sending

    Excerpt from the Billionmail/BillionMail README on GitHub (AGPL-3.0 license). © its authors.Read the full README on GitHub

    Daily snapshots

    Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots

    Sep 1: +8Sep 9: +7Sep 28: +51Oct 2: +11Oct 3: +9Oct 4: +12Oct 5: +14Oct 6: +7Oct 7: +4Nov 2: +31Nov 3: +25Nov 4: +10Nov 5: +7Nov 6: +8Nov 7: +9

    +781 stars over 80 days across 23 snapshot days; best day +51 on Sep 28.

    Forks

    1.8K+136

    Open issues

    252+26

    Compared with peers in Backend

    Fastest-growing repositories GStars tracks in this cohort for the week of Nov 8, by 7-day star growth

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