Every action has a key and every command a name. Mail, appointments and address books stay on your servers and in a local cache; there is no account with us and no telemetry.
Version 1.0.0-rc3, released 15 October 2026. Download the AppImage (207 MB) · other downloads
Screenshots of MailJD 1.0.0-rc3, taken automatically from example data: one fictional person's week of mail, appointments, tasks and contacts. Drag the line to compare the light and the dark theme.
Folder tree, list and reader in one window, the list flat or as threads built from the References and In-Reply-To headers. MailJD learns which folder a kind of mail belongs in and offers it in the status line; IMAP IDLE and NOTIFY keep every folder and its unread count current.
Every command has a name. The bar sits at the bottom left; Tab completes commands, folders, labels and dates inline, and the best match is always on top. Here "move lake" finds the Lakeside Library project folder.
Three reading modes per tab: plain text, HTML-light drawn by MailJD itself, and full HTML. Mail is cleaned before display, scripts never run, and remote images stay blocked until you allow them for a message or a sender's domain.
Search runs in the local cache of every folder first, so it works offline, then asks the server. Prefixes narrow it down: from:, to:, subject:, folder:, label:, date:, is:unread, has:attachment.
Day, week, month, year and agenda views of your CalDAV calendars, with reminders, recurring events and invitations answered from the mail. Changes made offline are sent when the server is reachable again.
Task lists from the same CalDAV server, with subtasks, due and start dates, priorities, tags and recurrence. A task made from a mail keeps a link back to it.
When an appointment, task, contact, rule or setting changed here and elsewhere, MailJD combines what does not overlap and shows the rest side by side: choose per field, per list entry and per line, and nothing is written before Apply.
CardDAV address books with groups. Addresses complete while you write, and every card lists the recent mail with that person.
Sieve rules run on the mail server, so mail is sorted while MailJD is closed. Make a rule from the open mail, edit it without writing script, and keep the rules other programs wrote. Out-of-office replies are part of it.
Replies start with the quote in place. Drafts are kept locally while you type and stored in the server's Drafts folder when you save.
The interface is English and German and follows the system language unless you choose one in the settings. The same example week, in German.
| IMAP with IDLE, NOTIFY, CONDSTORE, MOVE, UIDPLUS and ESEARCH; SMTP over TLS or STARTTLS | |
| Calendar and tasks | CalDAV with incremental sync (sync-collection), iCalendar, invitations by mail (iMIP) |
| Contacts | CardDAV with incremental sync, vCard |
| Server rules | ManageSieve and Sieve, including vacation replies |
| Push for calendars and contacts | WebDAV-Push through UnifiedPush (KUnifiedPush) or an ntfy server, encrypted end to end (RFC 8291) |
| Passwords | the system keyring: Secret Service (GNOME Keyring, KeePassXC) or KWallet |
No account with us, no cloud service, no telemetry, no web version, no Windows or macOS build.
| Package | What it is | Size |
|---|---|---|
| AppImage | one file, runs on its own | 207 MB |
| tar.gz | the same program as a directory | 223 MB |
| Gentoo | mail-client/qmailjd in the jd overlay | |
| Source | GPL-3.0-only, build with CMake and Qt 6 |
| Processor | x86_64 |
|---|---|
| System | glibc 2.35 or newer; tested on Ubuntu 22.04, Debian 12 and 13, Fedora 44 |
| Display | X11 or Wayland |
| Desktop | a Secret Service keyring or KWallet; notifications and a tray icon when available |
Every file is signed. With cosign and the key from the release page:
cosign verify-blob --key MailJD-release-cosign.pub \
--bundle MailJD-1.0.0-rc3-x86_64.AppImage.bundle MailJD-1.0.0-rc3-x86_64.AppImageeselect repository add jd git https://git.jdsoft.de/linux/jd.git
emaint sync -r jd
emerge mail-client/qmailjdInstalling, updating and removing · Changelog · All releases
| Item | What it measures | Value | For | When | Details |
|---|---|---|---|---|---|
| Pipeline | build, tests, sanitizers, coverage and packaging of every commit |  | main, now | pipelines | |
| Tests | automated test cases: unit, integration and UI tests against real Qt Quick windows | 8,844 test cases in 442 CTest targets, all passed | main @ 399ffe3d | 21 October 2026 | test report |
| Coverage | share of source lines and branches the tests execute | lines 91.5 %, branches 75.0 % (minimum 85 % and 72 %) | main @ 399ffe3d | 21 October 2026 | coverage report |
| Screenshots | taken by the pipeline from the example data, light and dark | 12 views | release 1.0.0-rc3 | ||
| Signed releases | every download signed with cosign, with SPDX SBOM and SLSA provenance | signature, SBOM, provenance | release 1.0.0-rc3 | 15 October 2026 | how to check |
How the project tests: docs/TESTING.md.