I successfully configured and deployed a secure, cloud-based Exim Mail Server for a private limited company using Ubuntu Server. The goal was to deliver a reliable, scalable, and professionally secured mail infrastructure suitable for corporate communication needs.
The project began by setting up and hardening a fresh Ubuntu cloud instance, configuring user controls, firewall rules, and essential system security. I then installed and configured Exim4 in a modular setup, allowing full control over SMTP routing, authentication, and transport settings.
A critical part of the deployment involved domain-level mail authentication. I configured SPF, DKIM, and DMARC to ensure proper sender validation and improve mail deliverability across major platforms like Gmail and Outlook. I also integrated Let’s Encrypt SSL certificates to enable secure TLS/SSL-encrypted mail transmission.
To further enhance security, I implemented SMTP authentication, rate limiting, Fail2Ban protection, HELO verification, and spam-control rules. Additional configurations such as mail aliases, virtual domains, and routing policies were tailored to meet the company’s operational structure.
After successful end-to-end testing—including inbox delivery, TLS verification, and spam analysis—the server was handed over with full technical documentation. The solution met all corporate requirements and delivered a stable, secure, and production-ready mail system.