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Screenshot of Mattermost website

// screenshot of mattermost.com ↗

PRODUCTIVITY & BUSINESS · PRO TIER

Mattermostpro

Mattermost is the self-hosted Slack alternative built for organizations with security, sovereignty, or compliance constraints. Real-time messaging, channels, threads, file sharing, voice/video calls, integrated CI/CD playbooks, and a deep integration model — all running on your infrastructure.

Install via WHMCS → Visit mattermost.com ↗
📝 Productivity & Business Min 2048 MB RAM Port 8065 (http) Tier pro
// What it is

A closer look.

Mattermost is the self-hosted Slack alternative built for organizations with security, sovereignty, or compliance constraints. Real-time messaging, channels, threads, file sharing, voice/video calls, integrated CI/CD playbooks, and a deep integration model — all running on your infrastructure.

Used by US Department of Defense, financial institutions, and regulated industries for the same reason European businesses pick it: data residency and on-prem control.

// Use cases

What it's for.

Concrete scenarios where teams pick Mattermost over the SaaS alternative.

◆

Internal team chat

drop-in Slack replacement, same workflow, your servers

◈

Cross-org collaboration

shared channels between organizations with full audit trail

◇

DevOps playbooks

incident response, on-call workflows, runbook execution from chat

▣

Compliance-bound communications

financial, healthcare, government use cases requiring data residency

▦

Air-gapped environments

defense, classified, isolated networks

// Who it's for

Built for these teams.

If your team profile matches one of these, Mattermost is a strong fit out of the box.

Profile A

Defense & government teams

under data residency mandates that prohibit US-based SaaS chat

Profile B

Financial services

with PCI / SOC 2 / internal compliance needs on chat content + audit

Profile C

Healthcare orgs

subject to HIPAA on internal communications; need verified residency + audit log

Profile D

DevOps teams

wanting playbook-driven incident response with full Mattermost Playbooks integration

Profile E

Air-gapped industrial / OT environments

defense, energy, manufacturing where internet egress is restricted

// Differentiators

Why teams pick Mattermost.

When evaluating self-hosted options for this category, here are the dimensions on which Mattermost consistently lands above the alternatives.

  • ✓Open source — (MIT for the Team Edition core, commercial enterprise add-ons)
  • ✓Data sovereignty — full control of where messages live, who has access
  • ✓Compliance certifications — FedRAMP, HIPAA-ready, ISO 27001
  • ✓Slack-compatible workflow — easy team migration from Slack
  • ✓DevOps-native — playbooks, GitHub / Jenkins / Jira deep integrations
  • ✓Open API + webhooks — for custom integrations
  • ✓Active LTS releases — for production stability
// Integrations

Connects to.

The stack you'll plug Mattermost into — services, protocols, and adjacent apps in the BluixApps catalog.

◇
DevOps tools
GitHub, GitLab, Jenkins, Jira, ServiceNow, PagerDuty, Datadog, Grafana
◈
Slack-compatible bots
most Slack bot APIs work with minimal adjustment
◆
Identity
OAuth (Google, GitHub, Microsoft), LDAP, SAML, AD integration
▣
Webhooks
bidirectional HTTP triggers for arbitrary external systems
▦
Voice + video
built-in WebRTC calls; Plugin Marketplace adds full conferencing
▩
File storage
S3-compatible object storage backend for messages and uploads
▼
E2E encryption
plugin (Enterprise tier) for highest-sensitivity rooms
// Adoption & deployment

Notable users & community

  • 30k+ GitHub stars
  • Production-deployed at US DoD, NASA, Samsung, financial regulators, EU government agencies
  • Active forum + Discord + monthly community webinars; LTS support model for enterprise
  • Public roadmap, predictable release cadence
  • Backed by Mattermost Inc. (US-based) with strong open-core commercial sustainability

What we ship

  • Docker compose: Mattermost Team Edition + Postgres + email gateway
  • Pinned mattermost/mattermost-team-edition:9.11.0 (LTS), tracking the LTS branch
  • HTTPS via Let's Encrypt — WebRTC / push notification endpoints correctly configured
  • Admin user created via first-run wizard; we surface the initial setup URL in the install report
  • File storage at /mattermost/data — sized per VPS allocation, optional S3-compatible backend
  • Backup hook covers Postgres + file storage volume
// Tips & operations

Run it properly.

Operational guidance from running this in production — what to do before you scale, what to lock down, what surprises people.

// PERFORMANCE
Use LTS branch in production
Team Edition LTS = 12+ months of security patches; mainline can have breaking changes
// SECURITY
Offload file storage to S3-compatible
local filestore/ grows fast; mount MinIO / S3 from day one for scale
// OPERATIONS
Wire SMTP early
invite, password reset, notifications all silently break without it; common day-one stumble
// RELIABILITY
Set up push notification proxy
official mattermost-mobile iOS / Android apps need the proxy to reach APNs/FCM
// DEPLOYMENT
Postgres tuning
max_connections >= 100 for active teams; default 100 is OK for small but throttles at scale
// SCALING
Plugin Marketplace ON only behind RBAC
random users installing arbitrary plugins is a real risk; admin-gate it
2048
// min ram (MB)
20
// min disk (GB)
8065
// access port
http
// protocol
pro
// bluixapps tier
postgres:15-alpine · mattermost/mattermost-team-edition:latest
// docker image

Project resources

Official sitemattermost.com ↗
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