Self-hosted / open sourceEmail (Personal)Headquarters: DE

mailcow (self-host): sovereignty score and 8 European alternatives

mailcow (mailcow: dockerized) is an open source groupware and mail server suite that you install and run yourself. Each service runs in its own Docker container, including Postfix and Dovecot for mail transport and IMAP/POP, Rspamd for spam filtering, optional ClamAV, and SOGo for webmail with CalDAV and CardDAV. A web interface lets you create domains and mailboxes. Further features include DKIM, two-factor authentication (TOTP, WebAuthn, Yubikey), a quarantine system and imapsync for migrating mailboxes. It is intended for administrators, businesses and organisations that want to operate their own mail server.

The project is maintained by The Infrastructure Company GmbH in Willich, Germany, which also holds the word mark. mailcow's own code is released under the GPL-3.0; bundled components carry their own licences. Because you install the software on your own servers or with a hoster of your choice, you decide where the data resides and who can access it. Paid support is available through Servercow. For a European organisation this is a self-hosting option from a German developer, with no dependency on an external cloud service.

See the 8 European alternatives ↓Assess your stack with mailcow (self-host) pre-selected

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Sovereignty score

94 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-2100
Headquartered in the EU: European law applies
Data residency SOV-3100
EU-only hosting
Cryptographic key sovereignty SOV-390
Self-hostable: encryption keys under your own control
Freedom from lock-in SOV-680
Open source: low switching costs
Source & runtime sovereignty SOV-4 · SOV-6100
Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked July 2, 2026

Headquarters	DE (EU)Verified by hand
Sovereignty model	Open-source, distributedVerified by hand
Data hosting	EUVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Hosting signal	FASTLY - Fastly, Inc., US (US)Technically measured
Category	Email (Personal)
Type	Product
Website	mailcow.email ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to mailcow (self-host)

The European alternatives to mailcow (self-host) come from our knowledge base of over 6,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

30 European Email (Personal) vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with mailcow (self-host)

mailcow (self-host) is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so mailcow (self-host) scores best on data residency.

mailcow (self-host) is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs mailcow (self-host) together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to mailcow (self-host)?

It depends on your use case. Strong EU alternatives to mailcow (self-host) include Bluewin Mail, CounterMail and Disroot. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to mailcow (self-host)?

Yes. Open-source EU alternatives to mailcow (self-host) include Disroot. These keep your data fully under your own control and let you self-host if you want to.

Is mailcow (self-host) GDPR-compliant and where is the data hosted?

mailcow (self-host) is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes mailcow (self-host) an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on July 2, 2026.

Sources

This record was checked via the vendor's website and legal notice during the full audit of June and July 2026. Source links have been recorded per record since 20 September 2026.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in Email (Personal)

Email (Personal): Personal email services — inbox, calendar, contacts. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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