GStars
    stalwartlabs

    stalwartlabs/stalwart

    All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

    backend
    caldav
    carddav
    imap
    jmap
    mail
    Rust
    15.7K stars
    1.0K forks
    15.7K GitHub watchers
    Updated Nov 4, 2026
    View on GitHub

    Build with Backblaze B2

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

    Explore Backblaze Labs

    Loading star history...

    Where it stands

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

    5 releases in the last 90 days, the latest today, with 55 contributors on GitHub.

    Peaked at #36 in the weekly ranking the week of Oct 19, its best in the past year.

    Use Cases & Benefits

    • Provides a secure, scalable mail and collaboration server supporting protocols like IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV.
    • Offers comprehensive protocol support with strong security features and flexible storage backends, all implemented in memory-safe Rust for robustness.
    • Use for deploying a multi-tenant email server with advanced spam filtering and message authentication in enterprise environments.
    • Use for managing calendaring, contacts, and file sharing with fine-grained access control in collaborative team settings.
    • Use for integrating secure mail services with automated TLS certificate provisioning and observability in cloud-native or containerized infrastructures.

    Should you depend on it?

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

    License

    No license detected

    No license file detected by GitHub: unless the project grants one elsewhere, the default is all rights reserved.

    Community files

    • README: present
    • Contributing guide: present
    • Code of conduct: present

    Watch-outs

    • Warning: No license file detected by GitHub: unless the project grants one elsewhere, you generally have no permission to use, modify or distribute the code.

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

    From the README

    Secure, scalable mail & collaboration server with comprehensive protocol support 🛡️ (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV)

    Stalwart is an open-source mail & collaboration server with JMAP, IMAP4, POP3, SMTP, CalDAV, CardDAV and WebDAV support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable.

    Excerpt from the stalwartlabs/stalwart README on GitHub. © 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: +21Sep 2: +10Sep 3: +38Sep 4: +17Sep 5: +14Sep 6: +8Sep 7: +24Sep 8: +6Oct 29: +41Oct 30: +37Oct 31: +48Nov 1: +42Nov 2: +34Nov 3: +44Nov 4: +34Nov 5: +25

    +1,484 stars over 79 days across 22 snapshot days; best day +48 on Oct 31.

    Forks

    1.0K+153

    Open issues

    42-31

    Compared with peers in Backend

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

    View category →
    stalwartlabs/stalwart compared with Backend repositories by stars, 7-day star growth, health score and last release
    RepositoryStars+7dHealthLast release
    anthropics/skills192.3K+5.2K75—
    zed-industries/zed94.7K+2.3K756 days ago
    google/skills23.8K+2.0K75—
    NationalSecurityAgency/ghidra99.4K+1.8K7519 days ago
    DuarteSantos8/openGym20.8K+1.7K757 days ago
    stalwartlabs/stalwart15.7K—45today
    Category median94.7K+2.0K75—
    Compare stalwart with skills, zed, skills →

    Discover Repositories

    Search across tracked repositories by name or description