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Tech

In our tech blog, we share technical insights, tutorials, and best practices from our daily work. Here you will find articles about topics such as Proxmox, Kubernetes, open-source infrastructure, system administration, and modern IT platforms.

  • grommunio Web redirects to Keycloak after authentication setup.

    grommunio-auth with Keycloak step by step

    Author:
    Mathias Rumbold
    Mathias Rumbold
    27 minutes read

    Practical guide for grommunio-auth 2026.06.1: installation, realm, OIDC client, user federation, web login, troubleshooting and hardening.

    : grommunio-auth with Keycloak step by step
  • Rspamd dashboard in grommunio-antispam 4.1.5 with scan counters, actions, Bayes statistics and version.

    Set up and operate grommunio-antispam with Rspamd

    Author:
    Mathias Rumbold
    Mathias Rumbold
    26 minutes read

    Practical guide for grommunio-antispam: understand mail flow, check Rspamd safely, test GTUBE, analyze false positives and operate whitelist/blacklist maps in a controlled way.

    : Set up and operate grommunio-antispam with Rspamd
  • grommunio 2026.06.1 release image

    Install grommunio 2026.06.1

    Author:
    Mathias Rumbold
    Mathias Rumbold
    42 minutes read

    Complete step-by-step guide: install the appliance, configure network and DNS, run setup, verify organization, domain, user, mailbox, TLS and mailflow.

    : Install grommunio 2026.06.1