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1stalwartlabs / stalwartAll-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).RustUnknown · Restricted / unknownInsufficient rank history15,6761,036——2026-11-02

2cypht-org / cyphtCypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)PHPLGPL-2.1 · Share derivative sourceInsufficient rank history1,786256——2026-11-02

3flectar / mailBuilt from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.RustAGPL-3.0 · Share derivative sourceInsufficient rank history1,739129——2026-11-02

4bulwarkmail / webmailSelf-hosted JMAP webmail for Stalwart Mail Server. Mail, calendar, contacts, and files in one client.TypeScriptNOASSERTION · Restricted / unknownInsufficient rank history1,420256——2026-11-01

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