Sep 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Email authentication transforms a vulnerable mail server into a secure, trusted sender. When operating a self-hosted mail server on a Linux distribution like Ubuntu or Red Hat, implementing the full suite of authentication protocols is mandatory for reliable inbox...
Jun 17, 2026 | Advanced Linux Scripting, Learn Linux in practical way
A step-by-step guide to resolving one of the most common Postfix + Dovecot integration issues If you’re running a mail server with Postfix and Dovecot, you’ve likely encountered this frustrating error in your mail logs: warning: sasl: connect to dovecot...
Jun 3, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Table of Contents Introduction Understanding Modern Email Attacks Initial iRedMail Security Review Postfix Hardening Dovecot Security Firewall Strategy Advanced Fail2Ban Configuration Automated Subnet Blocking for Mail Services Roundcube Webmail Security Monitoring...
Jun 3, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Table of Contents Introduction Initial Server Hardening SSH Security Firewall Configuration Fail2Ban Setup Automated Subnet Blocking KVM-Specific Security Monitoring and Maintenance Conclusion Introduction Running a KVM host server with multiple virtual machines...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
KVM virtual machines won’t start with “cannot execute binary /usr/bin/swtpm: Permission denied”? Learn how to fix SELinux blocking swtpm (TPM emulator) in 5 minutes. Complete guide with multiple solutions. You’ve just rebooted your KVM host...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Postfix postscreen failing with “error: open database …lmdb: No such file or directory”? Learn why this happens and how to fix it permanently in 2 minutes. Complete guide with scripts. You’ve just fixed the Postfix hash: to lmdb: conversion, but now...
