Category: Business Email & Groupware

8 European alternatives to Stalwart Mail — GDPR-compliant & EU-hosted.

Modern open-source email server written in Rust with JMAP support

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Facts

Headquarters: GB (OTHER)
Category: Business Email & Groupware
Type: Product
GDPR-compliant: Yes
Open-source: Yes
Data hosting: EU

Top EU-based & GDPR-compliant alternatives to Stalwart Mail

EGroupware
German open-source groupware platform with email, CRM, project management and more
DE · open-source
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Kolab
Swiss open-source groupware platform with email, calendar and file management
CH · open-source
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Kopano
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 The open-source Kopano Groupware (AGPL) is no longer maintained; Kopano Cloud is available under a commercial/proprietary license only.
NL · commercial
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Mailcow
German open-source email server platform with Docker-based installation
DE · open-source
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Mailu
Open-source email server in Docker with webmail, anti-spam and antivirus protection
FR · open-source
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Open-Xchange
German open-source email and groupware platform for providers and companies
DE · open-source
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Roundcube
open-source webmail-client with modern interface and plugin-architecture
CH · open-source
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grommunio
Austrian open-source groupware platform as an alternative to Microsoft Exchange
AT · open-source
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Frequently asked questions

What is the best European alternative to Stalwart Mail?

It depends on your use case. Strong EU alternatives to Stalwart Mail include EGroupware, Kolab and Kopano. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Stalwart Mail?

Yes. Open-source EU alternatives to Stalwart Mail include EGroupware, Kolab, Mailcow, Mailu, Open-Xchange, Roundcube and grommunio. These keep your data fully under your own control and let you self-host if you want to.

Is Stalwart Mail GDPR-compliant and where is the data hosted?

Stalwart Mail is headquartered in GB (OTHER) and hosts data in EU. The vendor states it is GDPR-compliant, but the data falls under non-EU jurisdiction. For full EU data residency the EU alternatives on this page usually offer more certainty.

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