Worked on the docker-mailserver repository to enhance documentation for the OVERRIDE_HOSTNAME environment variable, focusing on clarifying its purpose, correct usage, and compatibility. Used Markdown to revise and structure the documentation, incorporating direct links to related issues and discussions for improved traceability and user guidance. Applied documentation best practices and adhered to open-source standards, ensuring that configuration steps are clear and actionable. This update aimed to reduce misconfiguration risks and streamline onboarding for new deployments. The work demonstrated proficiency in Git-based workflows and technical writing, contributing to greater system reliability and lowering the support burden for the project maintainers.