Postfix
Industry-standard MTA component (not a full mailbox product)
oss-osi-approved stub guideOverview
Postfix is a mail transfer agent used inside many stacks. Listed so operators understand the building block behind mailcow and outbound relays—not as a turnkey member email product.
At a glance
| Field | Value |
|---|---|
| Categories | developer-platform, communication-chat |
| Deployment | self-hosted |
| License class | oss-osi-approved (IPL-1.0) |
| Cost model | free-self-hosted |
| Implementation difficulty | hard |
| Maintenance burden | medium |
| Maturity | stable |
| Verification | partially-verified (2026-07-17) |
Cost reality
Free software component; not a complete mail solution alone.
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:
- SMTP transport building block
Human oversight still needed
- Easy to misconfigure open relays
- Deliverability expertise required
Data held
-
mail queues
-
logs
-
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 | Verify license for the package you install from your distribution. |
| Operational | Plan backups, monitoring, and a restore drill before production use. |
Coworking fit
Roles: technical-operator
Workflows: incident-response
Problems: self-host-for-data-control, integrate-stack
Smallest useful experiment
Use only as part of a maintained stack (e.g., mailcow) unless you are an experienced mail admin.
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.