imap

stalwart

+254

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

flectar/mail

+149

Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 80 MB of RAM.

mailcraft

+55

MailCraft: an open-source, clean-room mail, calendar and contacts program in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.

mailcow-dockerized

+51

mailcow: dockerized - 🐮 + 🐋 = 💕

himalaya

+44

CLI to manage emails

docker-mailserver

+53

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

bichon

+26

Bichon – A lightweight, high-performance Rust email archiver with WebUI

penguin-mail

+23

Mail and calendar for Linux and macOS. Gmail and IMAP accounts, Google Calendar, contacts, OpenPGP and S/MIME. GTK4 and libadwaita, written in Rust.

Mailspring

+26

:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.