Years ago—probably around a decade—I was managing email servers for a large number of domains. To make that work manageable and secure, I built some small tools to help me verify and monitor email domain configurations. One of those tools was check-maildomain.

Back then, it really saved me a lot of time and helped improve the security posture of the domains I managed. Fast forward to today, and surprisingly (or maybe not), many email systems are still not configured properly. Misconfigured or poorly secured mail domains continue to be a common problem and a risk.

That’s why I decided to dig up my old project, modernize it a bit, and bring it back to life. My hope is that this tool can again be helpful, not just for me, but for others trying to harden their email systems.

Cybersecurity has only become more critical over the years, and good email hygiene is an essential part of that. Once the first updated version is finished, I hope it can contribute to making the internet a bit safer, one mail domain at a time.