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Comparison · Comms
Mailu vs Rocket.Chat
A side-by-side editorial comparison of Mailu and Rocket.Chat — release velocity, themes, recent moves, and the top alternatives to consider.
Mailu vs Rocket.Chat: at a glance
What is Mailu?
A mail server whose entire visible output is patching other people's code.
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
What is Rocket.Chat?
Rocket.Chat is building for the air-gapped enterprise, and adding an AI layer on the way
Rocket.Chat ships on a release-candidate train where a single .rc.0 carries every functional change and the RCs that follow it are pure version bumps. The 8.7.0-rc.0 drop is the substantive one: AI Search with semantic message results and optional OpenAI-compatible answers, FIPS-mode support across the monolith and all six microservices, phishing-resistant server-side OAuth, and an offline license flag that suppresses every outbound call to Rocket.Chat Cloud. Underneath, a systematic migration is replacing deprecated DDP methods with REST endpoints ahead of 9.0.
Mailu vs Rocket.Chat: editorial side-by-side
Mailu
5.0COMMS
A mail server whose entire visible output is patching other people's code.
◆ Current state
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
◆ Where it's heading
Most of what Mailu ships is downstream maintenance of its bundled components, Roundcube above all, which drove three of these ten releases. The project's own work here is defensive: escaping user-controlled fields in generated sieve scripts, setting X-Forwarded-By, adapting to Microsoft's new autodiscover. This is a product in steady-state operation, where the release notes track what upstream broke rather than what Mailu decided to build.
◆ Prediction
The next pinned release will most likely be another Roundcube or Alpine bump, since component upgrades triggered half the releases here. These entries say nothing about what is happening on the main branch.
Rocket.Chat
6.3COMMS
Rocket.Chat is building for the air-gapped enterprise, and adding an AI layer on the way
◆ Current state
Rocket.Chat ships on a release-candidate train where a single .rc.0 carries every functional change and the RCs that follow it are pure version bumps. The 8.7.0-rc.0 drop is the substantive one: AI Search with semantic message results and optional OpenAI-compatible answers, FIPS-mode support across the monolith and all six microservices, phishing-resistant server-side OAuth, and an offline license flag that suppresses every outbound call to Rocket.Chat Cloud. Underneath, a systematic migration is replacing deprecated DDP methods with REST endpoints ahead of 9.0.
◆ Where it's heading
Two pushes are converging. One is regulated and sovereign deployment — FIPS-compliant cryptography behind a licensed fips module, air-gapped workspaces that never phone home, ABAC attribute stores via Virtru in 8.6, and OAuth hardened with PKCE, CSRF and state validation plus 2FA enforcement on social logins. The other is an AI surface, introduced as AI Search plus an AI Center configuration page rather than a scattering of features. The DDP-to-REST work is the plumbing both depend on, and it is gated on the 9.0 boundary.
◆ Prediction
Expect 8.7 to reach general availability with AI Center expanded past search into a configurable model-provider surface, and the remaining DDP methods retired as 9.0 approaches. Whether the fips and offline license modules become a distinct compliance tier or stay bundled with the existing enterprise plan is not visible in these entries.
Alternatives to Mailu and Rocket.Chat
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 Mailu or Rocket.Chat.
Roundcube
After four years, Roundcube 1.7 lands — and the release stream is otherwise all CVEs
Signal Desktop
Signal's beta train is quietly handing group admins real moderation powers.
Notion
Notion is turning itself into the place other companies' agents come to work.
Slack
Slack's app platform is being rebuilt around agents, with the SDKs clearing old ground behind it.
Bird
Monthly digests showing AI chat latency cut hard, in a feed that repeats itself
See all Mailu alternatives → · See all Rocket.Chat alternatives →
Recent activity from Mailu and Rocket.Chat
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 13h agoRocket.Chat8.7.0-rc.3: Meteor package version bump only
- 5d agoMailuAutoconfig fix for modern K-9 Mail
- 7d agoMailuRoundcube 1.6.17 closes two CVEs
- 8d agoRocket.Chat8.7.0-rc.2: dependency bump, no functional change
- 8d agoRocket.Chat8.7.0-rc.1: dependency bump, no functional change
- 10d agoRocket.Chat8.7 adds AI Search, FIPS mode and phishing-resistant OAuth ⚡
- 12d agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 26d agoMailuAdmin UI keeps form values on failed submit
- 28d agoRocket.Chat8.6.0-rc.3: dependency bump, no functional change
- 1mo agoRocket.Chat8.6.0-rc.2: dependency bump, no functional change
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
- 2mo agoMailuRoundcube 1.6.16 and carddav 5.1.3 close CVE-2026-49217
Frequently asked questions
What is the difference between Mailu and Rocket.Chat?
They serve adjacent needs but don't currently overlap on shipped themes. Rocket.Chat is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Mailu better than Rocket.Chat?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Rocket.Chat is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Mailu?
Top Mailu alternatives in Comms are ranked by recent ship velocity. Browse the "Mailu alternatives" section above for the current picks, or visit /alternatives/mailu for the full list with editorial commentary on each.
What are the best alternatives to Rocket.Chat?
Top Rocket.Chat alternatives in Comms are ranked by recent ship velocity. Browse the "Rocket.Chat alternatives" section above for the current picks, or visit /alternatives/rocketchat for the full list with editorial commentary on each.