Mar 2, 2026 | Advanced Linux Scripting
Introduction Changing laptops is exciting, but it comes with a critical task: migrating your SSH keys. These keys are your digital identity—they grant you access to servers, GitHub, AWS, and countless other services. Lose them, and you’ll be locked out of...
Mar 2, 2026 | Advanced Linux Scripting
Introduction Secure Shell (SSH) is the backbone of secure remote server administration. Whether you’re managing a single VPS or a fleet of cloud servers, SSH keys provide the cryptographic foundation for authentication. However, one of the most common mistakes I...
Mar 2, 2026 | Advanced Linux Scripting
In today’s threat landscape, security compliance isn’t optional—it’s essential. Whether you’re running a single server or managing an enterprise infrastructure, knowing your security posture is the first step toward protecting your systems. Two...
Feb 25, 2026 | Advanced Linux Scripting
You can work through this checklist in phases. The goal is to systematically eliminate vulnerabilities and harden every layer of your server. Phase 1: Foundational Scanning & Vulnerability Assessment Before making changes, you need to know your current security...
Feb 25, 2026 | Advanced Linux Scripting
Spam emails are not just annoying—they’re a security risk and a drain on server resources. While basic spam filters catch obvious junk, Bayesian filtering provides intelligent, self-learning protection that improves over time. This guide will walk you through...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Default iRedMail installation is not production-ready. Learn how to harden your mail server with SSL certificates, SASL authentication, firewall rules, fail2ban, root security, rate limiting, and monitoring. Congratulations! You’ve installed iRedMail. The web...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Fail2ban is installed but are you getting alerts? Learn how to configure fail2ban for iRedMail, fix broken jails, and set up real-time notifications via email and Telegram. Your iRedMail server is being attacked. Right now. Open your mail logs and you’ll see a...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Emails from your iRedMail server going to Gmail spam folder? Learn how to set up SPF, DKIM, DMARC, PTR records, and warm up your IP address for perfect deliverability. You’ve set up iRedMail. SSL certificates are working. Authentication is perfect. But...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Apple Mail throwing “Unable to verify account name or password” errors with your iRedMail server? Learn the correct settings for IMAP, SMTP, SSL, and authentication that actually work. Suggested Featured Image Prompt: You’ve followed every tutorial....
May 22, 2026 | Uncategorized
You’ve opened ports 465 and 587 in firewalld, but connections still fail. Learn why rich rules, zones, and service definitions matter. Fix your email server firewall once and for all. You’ve run the command. You’ve double-checked it twice: sudo...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Tired of “untrusted certificate” warnings in your email client? Replace iRedMail’s self-signed SSL certificates with free Let’s Encrypt certificates. Step-by-step guide for Rocky Linux, Ubuntu, and more. You’ve just set up iRedMail and...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
You’ve just set up iRedMail, configured your domains, and created email accounts. Everything seems perfect until you try to send an email from your desktop client. Instead of a sent confirmation, you’re staring at an error message in your mail logs:...
May 22, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Introduction iRedMail is a powerful open-source mail server solution that comes with self-signed SSL certificates by default. While self-signed certificates work, they trigger security warnings in email clients like Apple Mail, Outlook, and Thunderbird. This tutorial...
Apr 21, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Essential Examples for System Administrators (Bridge, VLAN, and SSH Safety) NetworkManager’s command-line tool nmcli is a powerful utility for managing network connections on Linux servers. For system administrators, mastering nmcli is essential—it allows you to...
Apr 8, 2026 | Learn Linux in practical way
Introduction Managing firewall rules through Plesk’s web interface is straightforward, but there are times when you only have SSH access to your server. Whether you’re troubleshooting a lockdown situation, automating server configuration, or simply prefer...
