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Comparison · Comms
mailcow vs Openfire
A side-by-side editorial comparison of mailcow and Openfire — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:self-hosted
mailcow vs Openfire: at a glance
What is mailcow?
mailcow's release notes are almost entirely upstream security currency.
mailcow ships named seasonal releases with lettered revisions, and nearly every revision exists to pull in an upstream security fix - Redis, ClamAV, SOGo, Rspamd, nginx, unbound, Postfix. Revision B of the Mooly 2026 release updates Redis 7.4.10, ClamAV 1.4.6, and SOGo 5.12.10, adds minor web UI and nginx hardening, and removes a legacy DeltaChat sieve rule. The last release with genuinely new features was the March cut, which added forced 2FA, ACME DNS-01 challenges, and a passwordless autodiscover endpoint.
What is Openfire?
Openfire keeps its XMPP server current without changing what it is.
Openfire ships a maintenance release every one to two months, each a mix of dependency upgrades, MUC and pubsub correctness fixes, and occasional security hardening. 5.1.2 follows that shape exactly: Jetty, log4j2, and the PostgreSQL driver moved forward, three inapplicable Tomcat CVEs suppressed, and a set of MUC self-ping errors corrected to return the right XMPP error types. The last release with real feature content was 5.1.0 in June, which added channel binding and an admin console for failed server-to-server connections.
mailcow vs Openfire: editorial side-by-side
mailcow
5.0COMMS
mailcow's release notes are almost entirely upstream security currency.
◆ Current state
mailcow ships named seasonal releases with lettered revisions, and nearly every revision exists to pull in an upstream security fix - Redis, ClamAV, SOGo, Rspamd, nginx, unbound, Postfix. Revision B of the Mooly 2026 release updates Redis 7.4.10, ClamAV 1.4.6, and SOGo 5.12.10, adds minor web UI and nginx hardening, and removes a legacy DeltaChat sieve rule. The last release with genuinely new features was the March cut, which added forced 2FA, ACME DNS-01 challenges, and a passwordless autodiscover endpoint.
◆ Where it's heading
For a self-hosted mail stack that bundles a dozen upstream components, keeping current with their CVEs is the product, and mailcow has organized its release cadence around exactly that. The pattern is consistent: a named release with some feature content every few months, then lettered revisions that are pure security currency plus small web UI escaping and validation fixes. The web interface is where mailcow's own code gets hardened - HTML escaping in quarantine views and sieve editors recurs across several revisions.
◆ Prediction
Expect the next entry to be another lettered revision carrying upstream updates, with the next named release likely bundling whatever feature work has accumulated since March.
Openfire
2.5COMMS
Openfire keeps its XMPP server current without changing what it is.
◆ Current state
Openfire ships a maintenance release every one to two months, each a mix of dependency upgrades, MUC and pubsub correctness fixes, and occasional security hardening. 5.1.2 follows that shape exactly: Jetty, log4j2, and the PostgreSQL driver moved forward, three inapplicable Tomcat CVEs suppressed, and a set of MUC self-ping errors corrected to return the right XMPP error types. The last release with real feature content was 5.1.0 in June, which added channel binding and an admin console for failed server-to-server connections.
◆ Where it's heading
The project's direction is protocol conformance and operational currency rather than new capability. Recent cycles have gone into XEP compliance details - self-ping error semantics, XEP-0398 presence handling, base64 whitespace tolerance - and into keeping the dependency tree clean enough to pass a scanner. That is a reasonable posture for infrastructure a decade into deployment, and nothing in the last six releases suggests a change of scope.
◆ Prediction
Expect the same cadence: another patch in four to eight weeks carrying library bumps and MUC or pubsub conformance fixes, with anything larger held for a 5.2 line.
Alternatives to mailcow and Openfire
Other Comms products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either mailcow or Openfire.
Proton Bridge
Proton Bridge spends its first release in ten weeks on crashes, memory bounds and dead code
Stalwart
Stalwart is chasing mail RFCs and its own storage layer at the same time
Mux
Every manual control Mux ships now arrives with a Robots workflow that does it for you
Netcore Cloud
Netcore's feed remains a demand-generation channel; ten entries, zero product releases.
Rspamd
Rspamd closed a file-read hole any TCP client could reach, and taught the PDF parser to read fonts.
See all mailcow alternatives → · See all Openfire alternatives →
Recent activity from mailcow and Openfire
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agomailcow🏖️🐮 Mooly 2026 | Postfix 3.10.12, Rspamd 4.1.0 & Nginx 1.30.3 - Revision B
- 1d agoOpenfireOpenfire 5.1.2: MUC self-ping errors and library upgrades
- 20d agomailcow🏖️🐮 Mooly 2026 | Postfix 3.10.12, Rspamd 4.1.0 & Nginx 1.30.3 - Revision A
- 1mo agomailcow🏖️🐮 Mooly 2026 | Postfix 3.10.12, Rspamd 4.1.0 & Nginx 1.30.3
- 1mo agoOpenfireOpenfire 5.1.1: MUC and pubsub subscription fixes
- 2mo agoOpenfireChannel binding support and S2S connection diagnostics
- 2mo agomailcowThird May revision: unbound CVE and nginx 1.30.2
- 3mo agomailcowSecond May revision: quarantine table HTML escaping
- 3mo agoOpenfireOpenfire 5.0.5: dependency currency and logging fixes
- 3mo agomailcowSOGo 5.12.8 covering four upstream security issues
- 5mo agoOpenfireFixes high CPU from exception-based control flow
- 8mo agoOpenfireOpenfire 5.0.3: driver upgrades and MUC fixes
Frequently asked questions
What is the difference between mailcow and Openfire?
Both compete on the same themes — self-hosted — within Comms. mailcow is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is mailcow better than Openfire?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. mailcow is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to mailcow?
Top mailcow alternatives in Comms are ranked by recent ship velocity. Browse the "mailcow alternatives" section above for the current picks, or visit /alternatives/mailcow for the full list with editorial commentary on each.
What are the best alternatives to Openfire?
Top Openfire alternatives in Comms are ranked by recent ship velocity. Browse the "Openfire alternatives" section above for the current picks, or visit /alternatives/openfire for the full list with editorial commentary on each.