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goodmail

A webmail client that talks plain IMAP + SMTP to any mail server, with an Outlook-style three-pane interface: folder tree, date-grouped message list with previews, reading pane and an inline composer. Self-hosted, one small Node.js process, no database.

Start here

I want to…	Read
install goodmail	Getting Started
point it at my mail servers	Configuration
serve several domains from one install	Several Domains
learn the interface and the shortcuts	Using goodmail
use the calendar and the to-do list	Calendar and To-Do
set up mail rules (filters)	Mail Rules
turn on two-step sign-in and passkeys	Two-Step Sign-In
let users change or reset their password	Passwords
let domain administrators manage mailboxes	Administration
sign and encrypt mail	S-MIME
run it behind a reverse proxy	Deployment
back it up	Data and Backups
understand what it protects and how	Security Model
fix a problem	Troubleshooting
hack on it or add a language	Development

At a glance

• Sign in with just an e-mail address and password; a config file maps the domain to its servers.
• "Keep me signed in" for a year: a sealed cookie, no session database, your mail password is never stored in readable form.
• Reading pane renders HTML mail sanitised in a sandboxed iframe; remote images and trackers are blocked until you allow them.
• Extra accounts (iCloud, Gmail, Yahoo, GMX, WEB.DE, Fastmail or any IMAP mailbox) with combined views like "All inboxes".
• Address book, calendar, to-do list, signatures and templates, mail rules (Sieve), S/MIME, two-step sign-in, passkeys.
• Seven languages, light/dark themes with eight accent colours, works down to phone width.

Source: https://github.com/antongpopov/goodmail · License: AGPL-3.0-or-later.