mailcow: dockerized
Full-featured mail server stack if you must self-host email
oss-osi-approved stub guideOverview
mailcow packages a complete mail stack. Most coworking operators should prefer managed email; self-host only with strong deliverability skills and monitoring.
At a glance
| Field | Value |
|---|---|
| Categories | communication-chat, security-compliance |
| Deployment | self-hosted |
| License class | oss-osi-approved (GPL-3.0-only) |
| Cost model | free-self-hosted |
| Implementation difficulty | expert |
| Maintenance burden | medium |
| Maturity | stable |
| Verification | partially-verified (2026-07-17) |
Cost reality
Software free; IP reputation, backups, and on-call time are expensive.
Pricing and free-tier limits change frequently; re-check official pricing before budget decisions.
Tasks reduced or augmented
Software does not replace community or ops staff. It may reduce or augment:
- Self-hosted mailboxes
- Full control of mail data
Human oversight still needed
- Deliverability
- Spam/abuse handling
- Security updates
Data held
-
email
-
contacts
-
DKIM keys
-
Personal data: yes
-
Payment data: no / not primary
Risks
| Area | Notes |
|---|---|
| Vendor lock-in | Evaluate export formats and API completeness before deep customization. |
| Security | Apply updates promptly; restrict admin access; enable TLS. |
| Compliance | Operator remains responsible for privacy and local regulatory obligations. |
| Licensing | Confirm license fits commercial coworking use. |
| Operational | Plan backups, monitoring, and a restore drill before production use. |
Coworking fit
Roles: technical-operator
Workflows: incident-response, member-onboarding
Problems: self-host-for-data-control, privacy-compliance
Smallest useful experiment
Prefer a managed mailbox first. If self-hosting, run a lab domain for staff-only mail before any member mail.
Typical time to first value: 1–3 days
Links
Implementation guide
See the human-written implementation guide.
Verification
- Status:
partially-verified - Last reviewed:
2026-07-17 - Sources:
Seed entry compiled from official project sites and repositories. Re-verify pricing, license text, and feature claims before production decisions. Star counts and free-tier numeric limits intentionally omitted unless verified at review time.