DKIM and DMARC on Postfix with OpenDKIM and OpenDMARC
SPF, DKIM signing with OpenDKIM, DMARC policy, and verification with OpenDMARC on Postfix, tested on Ubuntu 24.04 and 26.04.
dns
Understanding the /etc/hosts file
/etc/hosts is the list of names your machine resolves on its own without asking anyone else. A line there takes precedence over the entire internet’s DNS — making it an excellent tool for development and testing, … Read more
Getting to Know DNS
What is DNS DNS stands for Domain Name System (Sistema de Nomes e Domínios in Portuguese), which converts the website domain names people type into web browsers into IP numbers. … Read more