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Repositories in this selection 20 · UTC 2026-11-04
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1—Ddocker-mailserver / docker-mailserverAuthor description: Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.ShellMIT · PermissiveInsufficient rank history19,7182,133——2026-11-02
2—FFoundry376 / Mailspring:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.TypeScriptGPL-3.0 · Share derivative sourceInsufficient rank history17,9911,065——2026-11-02
3—Sstalwartlabs / 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
4—Mmailcow / mailcow-dockerizedA Docker-based email and groupware suite combining mail delivery and retrieval, spam filtering, webmail, and domain and mailbox administration.JavaScriptGPL-3.0 · Share derivative sourceInsufficient rank history13,7361,864——2026-11-01
5—MMailu / MailuInsular email distribution - mail server as Docker imagesPythonNOASSERTION · Restricted / unknownInsufficient rank history7,5991,027——2026-11-02
6—Ppimalaya / himalayaCLI to manage emailsRustApache-2.0 · PermissiveInsufficient rank history7,579264——2026-11-02
7—Jjstedfast / MailKitA cross-platform .NET library for IMAP, POP3, and SMTP.C#MIT · PermissiveInsufficient rank history6,871867——2026-11-01
8—Ffoxcpp / maddy✉️ Composable all-in-one mail server.GoGPL-3.0 · Share derivative sourceInsufficient rank history6,116342——2026-11-02
9—Ttwisted / twistedEvent-driven networking engine written in Python.PythonNOASSERTION · Restricted / unknownInsufficient rank history5,9981,228——2026-11-03
10—Iimapsync / imapsyncImapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website isShellNOASSERTION · Restricted / unknownInsufficient rank history4,197531——2026-09-24
11—Nneomutt / neomutt✉️ Teaching an Old Dog New Tricks -- IRC: #neomutt on irc.libera.chatCGPL-2.0 · Share derivative sourceInsufficient rank history3,860354——2026-11-02
12—Rrustmailer / bichonBichon – A lightweight, high-performance Rust email archiver with WebUIRustAGPL-3.0 · Share derivative sourceInsufficient rank history2,06691——2026-11-02
13—Llavabit / magmaThe magma server daemon, is an encrypted email system with support for SMTP, POP, IMAP, HTTP and MOLTEN,. Additional support for DMTP and DMAP is currently in active development.CAGPL-3.0 · Share derivative sourceInsufficient rank history1,828165——2025-03-06
14—Ccypht-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
15—Fflectar / 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
16—Fforwardemail / forwardemail.netPrivacy-focused encrypted email for everyone. All-in-one alternative to Gmail + Mailchimp + Sendgrid.JavaScriptNOASSERTION · Restricted / unknownInsufficient rank history1,702206——2026-11-03
17—Ddovecot / coreDovecot mail serverCNOASSERTION · Restricted / unknownInsufficient rank history1,278365——2026-11-03
18—Kkurrier-org / kurrierKurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.TypeScriptNOASSERTION · Restricted / unknownInsufficient rank history1,06774——2026-11-01
19—Aagenticmail / agenticmailEmail, SMS & phone-call infrastructure for AI agents — send and receive real email and text messages, and place agent-driven outbound voice calls, all programmaticallyTypeScriptMIT · PermissiveInsufficient rank history24440——2026-11-01
20—Ddmarcguardhq / parse-dmarcDMARC aggregate report parser with a built-in dashboard. One Go binary, IMAP in, SQLite, Prometheus metrics, MCP server. Apache-2.0.GoApache-2.0 · PermissiveInsufficient rank history22626——2026-11-02
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