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CONFIGURATION.md

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Configuration

The installer writes two protected environment files:

  • /etc/vibmail/vibmail.env (root:vmail, mode 0640)
  • /etc/vibmail-public-contact/contact.env (root:root, mode 0600)

Primary settings include the mail/application hostnames, MariaDB credentials, storage paths, message and attachment limits, ingestion interval, session age, proxy trust, log location, and live-update bounds. The committed .env.example files contain placeholders only.

Production settings validate hostnames, IP addresses, absolute storage paths, SQL identifiers, the application origin, and minimum secret strength. Changing the mail domain after mailboxes exist is a migration project, not an environment-only change.

HSTS

The reference installer emits a one-year HSTS policy with includeSubDomains and preload, and sets SECURE_HSTS_PRELOAD=true for the application. The preload token does not itself submit a domain to browser preload lists. Operators must review every subdomain before making any separate preload-list submission.