17 European Business Email & Groupware vendors.
Business Email & Groupware: Business email servers, groupware, calendar and contact management. Below, every vendor in the knowledge base headquartered in the EU or the EEA, each checked by us for headquarters, owner, hosting and licence. Non-European vendors are listed at the bottom with a link to their European alternatives.
25 vendors in total: 17 European, 4 American, 4 other; 22 open source. Last checked: 4 October 2026.
Why this matters for digital sovereignty
Business email and calendars carry the core of your organisation's communication, and a US-owned provider falls under the CLOUD Act and FISA 702 regardless of where the data is stored. Check where servers and backups actually sit, who ultimately owns the vendor, and whether you control the encryption keys yourself.
European vendors
- AxigenEU sovereign
Romanian enterprise email server with webmail, calendar and instant messaging
Romania
- Benno MailArchivSelf-hosted / open source
German, audit-proof enterprise email archiving system for GDPR/GoBD-compliant storage of millions of emails, integrable with any email/groupware system. Developed by LWsystems GmbH (Bad Iburg); core and web app under AGPLv3, some modules proprietary.
Germany · open-source
- CipherMailSelf-hosted / open source
Amsterdam-developed open-source email encryption gateway that centrally enforces S/MIME, PGP and PDF encryption for all outgoing organisational traffic, acting as a mail proxy between the firewall and internal mail server.
Netherlands · open-source
- DovecotSelf-hosted / open source
Open-source IMAP and POP3 server from Finland (Dovecot Oy), part of German Open-Xchange since 2017. High-performance storage and synchronisation of email within enterprise networks.
Finland · owner in Germany · open-source
- EGroupwareEU sovereign
German open-source groupware platform with email, CRM, project management and more
Germany · open-source
- grommunioSelf-hosted / open source
Austrian open-source groupware platform as an alternative to Microsoft Exchange
Austria · open-source
- KolabEU sovereign
Swiss open-source groupware platform with email, calendar and file management
Switzerland · open-source
- KopanoEU sovereign
Kopano Cloud is the proprietary successor to Kopano Groupware, which reached end-of-life on March 31, 2025. The open-source Kopano Groupware (AGPL) is no longer maintained; Kopano Cloud is available under a commercial/proprietary license only.
Netherlands
- MailcowSelf-hosted / open source
German open-source email server platform with Docker-based installation
Germany · open-source
- MailStore ServerEU-hosted, non-EU parent
German enterprise standard for legally sound, GDPR-compliant email archiving, installable locally on your own infrastructure. Developed by MailStore Software GmbH, a subsidiary of Canadian OpenText since 2024.
Germany · owner in Canada
- MailuSelf-hosted / open source
Open-source email server in Docker with webmail, anti-spam and antivirus protection
France · open-source
- MoxSelf-hosted / open source
Modern, Go-based single-binary mail server (MIT licence) that sets up email authentication (SPF, DKIM, DMARC) out of the box. Developed by Mechiel Lukkien (Amsterdam, Netherlands), co-funded by NLnet; no controlling company.
Netherlands · open-source
- Open-XchangeEU sovereign
German open-source email and groupware platform for providers and companies
Germany · open-source
- Proxmox Mail GatewaySelf-hosted / open source
Open-source email security solution (AGPLv3 with commercial subscriptions) from Austria's Proxmox Server Solutions GmbH, acting as a mail proxy between the internet and the internal mail server against spam, viruses and phishing. A distinct product from the better-known Proxmox VE virtualisation platform.
Austria · open-source
- RadicaleSelf-hosted / open source
Lightweight open-source CalDAV and CardDAV server (calendar and contacts, GPLv3), ideal for decoupling from Google/Apple cloud sync. Originated at French web consultancy Kozea; no controlling company in the classic sense, community-maintained.
France · open-source
- RoundcubeSelf-hosted / open source
open-source webmail-client with modern interface and plugin-architecture
Switzerland · owner in Germany · open-source
- Tine 2.0Self-hosted / open source
German open-source groupware suite (email, calendar, contacts, CRM, HR/personnel management, file sharing) developed and sponsored by Metaways Infosystems GmbH, based in Hamburg. Tine 2.0.Org community edition is licensed under AGPLv3; Metaways offers commercial support, managed hosting (tine20.com/tine20.net), and enterprise editions. Actively maintained as of 2026 with a live commercial offering.
Germany · open-source
Non-European vendors in this category
For each vendor, the page with European alternatives and the sovereignty profile.
- Self-hosted / open sourceCyrus IMAPUnited States · 8 EU alternatives
- Self-hosted / open sourceEximUnited Kingdom · 8 EU alternatives
- Non-EU vendoriRedMailChina · 8 EU alternatives
- Self-hosted / open sourceMail-in-a-BoxUnited States · 8 EU alternatives
- Self-hosted / open sourcePostfixUnited States · 8 EU alternatives
- Non-EU vendorSOGoCanada · 8 EU alternatives
- Non-EU vendorStalwart MailUnited Kingdom · 8 EU alternatives
- Non-EU vendorZimbraUnited States · 8 EU alternatives
Frequently asked questions
Which European Business Email & Groupware vendors are there?
The knowledge base lists 17 European Business Email & Groupware vendors, including Axigen, Benno MailArchiv, CipherMail and Dovecot. Every record is checked for headquarters, ultimate owner, hosting locations and licence.
Are there open-source options for Business Email & Groupware?
Yes. Open-source Business Email & Groupware software from Europe includes Benno MailArchiv, CipherMail, Dovecot and EGroupware; you can self-host it with the encryption keys under your own control.