E-mail servers rely on various DNS records to ensure proper function, security, and deliverability. Configuring these records correctly can protect your domain from spoofing, phishing, unauthorized use, improve e-mail deliverability, and protect your reputation. This article provides an in-depth explination of the DNS records which are crucial for e-mail server operations and security, including newer standards, like BIMI and MTA-STS.

Recently, I needed to redo my email server. The mail reasons for this were that I was finding it hard to control spam, and I could not send email. As I was looking around for a guide, or for examples I found the Citadel software. Citadel is a one stop solution, so rather than installing multiple pieces of software for different aspects of a mail server I install, and secure one. Citadel has a long heritage coming out of the BBs scene of the 1980s and 1990s.

A while ago, I wrote about some fun things to do to help secure your servers. Among the things I included was information about SSH banners, and Message of the Day files. At the time, I was not able to generate dynamic content for the Message of the day. Recently, I learned how to accomplish dynamic content on CentOS/Redhat based Linux systems. My goals for this project was to show the following:

Over the last few weeks I’ve been working on a Perl English to Pig Latin script. For testing I used the text of The Time Machine by: H.G. Wells from Project Guttenberg. You can get the full code, and the text I used for testing at my GitHub Repo. The idea of this program, is that it can take an English Language text file, and change it into Pig Latin.

I was challenged to write Hangman. It started out with a simple enough idea. Have the computer pick a word from a wordlist, and present the hangman structure, and proceed through the game. As is often the case, while the idea is simple, it took me a bit to figure it out. See my Github Repo for the full code.