What is Kurrier?

A modern, self-hosted workspace that combines email, calendars, contacts, and file storage in a single web interface. It works with existing email providers through IMAP, SMTP, AWS SES, SendGrid, Mailgun, and Postmark; syncs calendars via CalDAV with Apple Calendar, Thunderbird, DAVx⁵, and Outlook; syncs contacts via CardDAV across iOS, Android, macOS, Windows, and Linux; and provides WebDAV/S3-backed file storage with sharing. Authentication options include local accounts, Google OIDC, and generic OIDC providers. The application is API-first with a management API for provisioning. Deployment uses Docker Compose with PostgreSQL and Redis, with a minimum of 1 GB memory and one CPU core. Licensed under AGPL-3.0-or-later. Hosted versions are available at Kurrier.io and Kurrier Mail.

Should you self-host Kurrier?

Kurrier scores 55/100 on selfhost.directory (how scoring works) and ranks #43 of 106 in Email. It has 1 066 GitHub stars.

It shipped 6 stable releases in the past year. The latest, v4.3.0, came out on 24 September 2026. New versions land roughly every 4 days.

Setup is moderate: expect some configuration beyond a single command. It is Other-licensed and written mostly in Typescript.

Its closest alternative on selfhost.directory is Listmonk (80/100, 24 019 stars). It scores higher overall, so compare the two before you pick. See Kurrier vs Listmonk side by side.