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Self-Hosted Productivity Communication Email Calendar Groupware Webmail Contacts

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Last Updated: 08-25-2026 02:18 AM (UTC)

Kurrier

Kurrier unifies email, calendars, contacts, and file storage in a single web interface that connects to any email provider you already use. The Next.js frontend with Nitro API worker deploys via Docker Compose on PostgreSQL and Redis, delivering a cohesive workspace where IMAP/SMTP mailboxes from Gmail, Outlook, or corporate servers sit alongside transactional providers like AWS SES, SendGrid, Mailgun, and Postmark. Automatic inbox building handles threads, attachments, sent items, and deletion sync through persistent background polling. The CalDAV backend enables full two-way calendar synchronization with iOS, macOS, Android via DAVx5, and Thunderbird, supporting event invitations, RSVP processing through the inbox, timezone-aware scheduling, and contact-aware attendee linking. CardDAV contacts sync bidirectionally across all devices with unified name, avatar, and email resolution. Kurrier Drive provides integrated file storage through WebDAV locally or S3-compatible backends for cloud storage. Multiple identities and domains let you manage several email accounts from different providers in one interface, with fast local search indexing subjects, senders, and content without dependency on external APIs. The API-first architecture exposes clean endpoints for automation and custom integrations. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

Kurrier
Kurrier
Kurrier
Kurrier
Kurrier

Benefits

  • Unified Email Calendar Contacts Storage
  • Consolidates IMAP/SMTP email, CalDAV calendars, CardDAV contacts, and WebDAV/S3 file storage into a single self-hosted web interface eliminating the need for separate applications.
  • Connect Any Email Provider
  • Supports standard IMAP/SMTP servers plus AWS SES, SendGrid, Mailgun, and Postmark transactional services with multiple identity and domain management from one dashboard.
  • Full Cross-Device Synchronization
  • CalDAV and CardDAV protocols enable bidirectional sync with iOS, macOS, Android DAVx5, and Thunderbird including event invitations, RSVP processing, and timezone-aware scheduling.
  • Privacy-First Self-Hosted Architecture
  • All data including credentials, mail, events, and files stays on your server with zero external analytics or telemetry and no vendor lock-in through open standard protocols.

Features

  • Multi-Provider Email
  • Connect Gmail, Outlook, SES, SendGrid, Mailgun, Postmark, or any IMAP/SMTP server with automatic inbox building, threaded conversations, and continuous background synchronization.
  • CalDAV Calendar Engine
  • Standards-compliant calendar backend with two-way sync, event invitations, attendee RSVP processing, multiple calendar collections, and timezone-aware scheduling across all platforms.
  • CardDAV Contact Sync
  • Bidirectional contact synchronization across iOS, macOS, Android, and desktop clients with unified name resolution and automatic attendee linking from calendar events.
  • Integrated File Storage
  • Kurrier Drive provides WebDAV local storage or S3-compatible cloud backends for managing files directly within the workspace without external file hosting services.
  • Local Search Indexing
  • Fast full-text search across subjects, senders, and message content using local PostgreSQL indexing without dependency on cloud APIs or external search services.