Mailcow

Full self-hosted mail stack. Very fair, heavy to operate for a small NGO.

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GPL-3.0 · https://mailcow.github.io/mailcow-dockerized-docs/

Email

Self-hosted

Hosting: Self-hosted

Only propose this when the organisation has mail operations skills.

Fair 5.0 Easy 2.3 Secure 3.7

Pillar	Criterion	Score	Evidence
Easy	Day-one UX Can non-technical staff use it without a project?	2	Admin UI exists; end users need a mail client story. Source
Easy	Operate Admin burden, updates, backups and language coverage.	1	Spam, DNS, TLS and upgrades are a specialist job. Source
Easy	Integrate SSO, mail/CalDAV, APIs and common NGO connectors.	4	IMAP, CalDAV, SOGo and LDAP/OIDC options. Source
Fair	Lock-in / exit Can you leave with your data in open formats, at known cost?	5	You hold the maildirs; IMAP export is native. Source
Fair	Sovereignty EU legal entity, EU hosting, and exposure to extra-EU lawful access?	5	Host wherever you choose, including EU. Source
Fair	Openness Open source or open standards? Are independent implementations possible?	5	Open source mail stack on standard protocols. Source
Secure	IT security Authentication, encryption, patch cadence and independent audit.	4	Security tracks how well you run it. Source
Secure	User security 2FA, roles, phishing resistance and safe defaults.	3	SOGo/2FA possible; phishing depends on user training. Source
Secure	Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture.	4	No SaaS processor if you host and log lawfully in the EU. Source