What is the rua tag in my DMARC record

I kept getting emails from noreply-dmarc-support@mydomain.com every day. After finishing a cool bucket hat design I wondered What is the rua tag in my DMARC record? Then, I did a little investigation and I remembered I set this myself when I was setting up my DMARC records in DNS. The rua tag in a DMARC …

How to use Telnet in Linux

Telnet is a network protocol used to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection. Here’s how you can install and use Telnet on a Linux system. I had to take a long walk in NYC before taking on this one. I assumed Telnet was no longer in use by anybody. …

Flask Application Skeleton Example

A friend called me the other day wanting to learn more about putting together a Flask application. After brewing a good Catimor coffee variety from Dominican Republic I decided to get a sample Flask code for starters and share it with everybody. This Flask application includes: You can save this code to a Python file …

Docker CLI basic commands

Docker is like a virtual box that lets you put your app inside and run it without worrying about messing up your computer. It’s like having a bunch of separate little rooms where you can run different apps at the same time without them bothering each other. Each room (or container) is lightweight and has …

Connect to Exchange Online using PowerShell

This one was a new experience for me. After brewing a good cup of Caturra variety coffee at home, a friend contacted me wanting to connect to Exchange online using PowerShell. This was due to some strange email activity with one of her users. Connecting to Exchange Online using PowerShell allows administrators to manage Exchange …

Configure log rotation for Postfix on Linux

A client running a postfix server called me the other day wanting to configure log rotation for Postfix on Linux. This was a Redhat box and I didn’t have much experience configuring log rotation. After my trip to Coyoacan in Mexico City I was very relaxed and started putting things together. Below is what I …

SEO Ready Website for Maximum Visibility

Making your website SEO ready involves optimizing various aspects of your site to improve its visibility and ranking in search engine results. I have to admit this topic is not my favorite, but is important if you want your website to be found by our good friend Google and other search engines. After brewing my …

Print the email addresses with status=”bounced” in postfix mail log

To print the email addresses with status “bounced” only from the provided log file, you can use grep to filter lines containing “status=bounced” and then use awk to extract the email addresses. Here’s how you can do it: Explanation: This series of commands will extract and print only the email addresses from lines with status …