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Nextcloud MailSOGo
Free

Free and open source; installed as an app on a Nextcloud server.

 Free

Free and open source; paid premium support is offered separately.

Web, Self-hosted Web, Self-hosted
  • Runs on your own Nextcloud server
  • Works with existing IMAP accounts
  • Webmail, calendars and contacts in one self-hosted server
  • CalDAV, CardDAV and ActiveSync support for native and mobile clients
  • Needs a working Nextcloud installation
  • Does not host mailboxes itself
  • Needs existing mail and directory servers to integrate with
  • Outlook support depends on a separate CalDAV synchronizer
Self-hosted Self-hosted
Open source Open source
License not stated License: GPL-2.0-or-later / LGPL-2.0-or-later
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.