DeciusAc

Free sysadmin, security and AI tools, explained fast.

Quick fixes for Linux, DNS, email security (SPF, DKIM, DMARC), Docker, Mailcow and more, plus prompt engineering tips for Claude and ChatGPT. No fluff, just the command or the setting that fixes it.

Every tool shown here is free at https://deciusac.com: 50+ security and network tools, IT tutorials, and a Chrome extension.

New Shorts daily. Tutorials and tool walkthroughs every week.