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Technical guides from real engineering practice: installation, integration, automation, troubleshooting and production operation of modern Linux and open-source platforms. The articles connect concrete configuration with architecture, security, lifecycle, monitoring and operations.

  • grommunio Web 5 in the lab: Alice sees the mounted shared mailbox with the delegated Finance folder.
    grommunio & Groupware

    grommunio Web 5.0 in the lab

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    6 minutes read

    Technical deep dive into Web 5 with shared-mailbox automounts, grommunio/v1 settings and a strict acceptance matrix.

    : grommunio Web 5.0 in the lab
  • grommunio Web showing Bob with the mounted shared mailbox and allowed folders
    grommunio & Groupware

    grommunio: Replace Public Folders with a functional mailbox

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    14 minutes read

    Step-by-step guide with tested folder ACLs, grommunio Web automount, cross-domain permissions, Send-As, alias delivery and Thunderbird GUI evidence.

    : grommunio: Replace Public Folders with a functional mailbox
  • grommunio Web ist vor dem Failover über die hs1-VIP erreichbar.
    grommunio & Groupware

    grommunio 2026 Cluster and High Availability: from multi-server lab to tested active/standby homeserver

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    17 minutes read

    Part 10 shows grommunio HA with DRBD, Pacemaker, Corosync, STONITH, witness, VIP and an active/standby homeserver.

    : grommunio 2026 Cluster and High Availability: from multi-server lab to tested active/standby homeserver
  • grommunio Admin zeigt mehrere Organizations als zentrale Mandantenstruktur.
    grommunio & Groupware

    grommunio Multitenancy 2026: organizations, domains and multiple LDAP sources

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    9 minutes read

    Part 9 of the grommunio 2026 series classifies multitenancy realistically: organizations, domains, per-organization LDAP, admin boundaries, mail flow, GAL, calendar, MDM and MSP limits.

    : grommunio Multitenancy 2026: organizations, domains and multiple LDAP sources
  • grommunio Web shows the registered ActiveSync device under Mobile Devices.
    grommunio & Groupware

    grommunio MDM 2026 step by step: manage ActiveSync devices safely

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    8 minutes read

    Practical guide for grommunio Mobile Device Management with Exchange ActiveSync, grommunio Sync, device overview, resync, remove and remote-wipe safety.

    : grommunio MDM 2026 step by step: manage ActiveSync devices safely
  • Opened archived message with restore action in grommunio Archive.
    grommunio & Groupware

    Set Up grommunio Archive 2026

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    10 minutes read

    Step-by-step email archiving with grommunio Archive: installation, mail flow, search, restore, backup and monitoring.

    : Set Up grommunio Archive 2026
  • grommunio Files and Office with files, share status and Office integration.
    grommunio & Groupware,  Enterprise Linux

    grommunio Files and Office 2026 step by step

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    16 minutes read

    Practical guide for grommunio Files and Office: installation, Web entry, SSO classification, DOCX/XLSX/PPTX, sharing, saving, backup and troubleshooting.

    : grommunio Files and Office 2026 step by step
  • Operations channel with active user and visible channel structure.
    grommunio & Groupware,  Enterprise Linux

    grommunio Chat 2026 step by step

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    10 minutes read

    Practical guide for grommunio Chat: installation, database, nginx upstream, domain teams, WebSockets, two users and multi-tenancy.

    : grommunio Chat 2026 step by step
  • grommunio Meet before joining the test room.
    grommunio & Groupware,  Enterprise Linux

    grommunio Meet 2026 step by step

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    14 minutes read

    Set up grommunio Meet: web integration, Jitsi components, Videobridge, UDP/ICE, SSO adapter and multi-user test.

    : grommunio Meet 2026 step by step
  • grommunio web login as card image for central sign-in with Keycloak and MFA.
    grommunio & Groupware,  Identity & Access,  Enterprise Linux

    Run grommunio-auth with Keycloak in production

    Author:
    ForgeOneStamenography 17.
    Mathias Rumbold
    14 minutes read

    Central sign-in for grommunio: grommunio-auth, Keycloak, realm, user federation, MFA, login test, logout redirect and hardening.

    : Run grommunio-auth with Keycloak in production