Mattermost: 736,893 Fingerprint Matches on Self-Hosted Collaboration Mattermost is a self-hosted collaboration platform: channels, direct messages, file sharing, and an integration surface built from webhooks, slash commands and bots. Organisations choose it because the conversations stay on infrastructure they control, which is a reasonable motivation and also the reason the operator inherits every consequence of running it. A chat server is close to the centre of how an organisation works...