Why Keeping DNS Records Current is Important
Learn why keeping DNS records current is necessary to prevent attackers from taking over a subdomain.
Hello 👋
I'm John. This site hosts a collection of articles and tutorials based on my work in full stack web development. My areas of expertise include:
- Linux operating systems
- Apache and Nginx web servers
- PostgreSQL databases
- Python and PHP scripting languages
- Email deliverability, including DMARC, SPF, and DKIM
Recent articles
Using Python to Find an Available Seat for the SAT
Trying to register for the SAT but there’s no availability? Here’s how to find a seat using Python.
How to Configure OpenDKIM with Postfix
If you send email from a Postfix mail server, configuring OpenDKIM is necessary to authenticate your domain. Without it, email providers like Gmail and Yahoo will junk or reject your emails. Here’s how to set it up.
Linux Commands for Web Developers
It is the responsibility of web developers to understand how their code is impacting the server environment. Here are a few essential commands to gauage your impact.
A Simple Guide to Configuring and Hardening Ubuntu Server
This tutorial covers the bare minimum configuration and hardening you should apply to any new Ubuntu server.
A Simplified Explanation of DMARC
To help understand how DMARC compliance works, and why SPF and/or DKIM alignment is necessary, I find that a postal service analogy works best.