The current version of mailcow is 2026-09 (as of 22/09/2026). patchletter checks the official source daily and emails you new releases.
mailcow at a glance
mailcow is a popular open-source, Docker-based mail server suite (Postfix, Dovecot, Rspamd and a web UI), widely self-hosted. mailcow ships regular updates via its update script plus security fixes; as an internet-facing mail system, timely patching and hardening are essential.
For admins updates run through the provided update script, which pulls new container images — back up first (mailcow includes a backup script) and read the release notes for breaking changes. A mail server is a high-value, exposed target: keep TLS current, enforce strong authentication, maintain SPF/DKIM/DMARC, and watch for open-relay misconfiguration. The many bundled components each carry their own fixes, delivered together in mailcow releases. After updating, verify mail flow, the web UI and spam filtering. Track the project's releases closely; patchletter surfaces new mailcow updates.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 2026-09 | STABLE | 22/09/2026 | Release notes → |
| 2026-07 | STABLE | 14/07/2026 | Release notes → |
| 2026-05 | STABLE | 08/07/2026 | Release notes → |
Frequently asked questions
- What is the latest version of mailcow?
- mailcow 2026-09, released 22/09/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the mailcow release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new mailcow updates?
- Tick mailcow off in the catalogue and leave your address. From then on new versions go out by email — one at a time, or bundled in the daily or weekly digest.
An email as soon as a new mailcow version ships
We reconcile the vendor source daily. When a new version appears, it lands in your inbox right away or bundled as a digest. The update email is free and ends with one click. Alerts about vulnerabilities and end of support are part of patchletter Pro.
Embed this badge
The badge shows the current mailcow version and keeps it up to date. Anyone may embed it, no account needed.
[](https://patchletter.com/en/software/mailcow)https://patchletter.com/badge/mailcow.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
