Virtualization tutorial - IT technology blog
Posted inVirtualization

Deploying Proxmox Mail Gateway as a Protective Layer for Your Mail Server: A Professional Guide to Virtualizing Spam and Malware Filtering

A step-by-step guide to deploying Proxmox Mail Gateway (PMG) as a protective layer in front of an internal mail server, filtering spam and scanning for viruses using SpamAssassin and ClamAV. Covers installation, relay domain configuration, filter rule creation, and quarantine monitoring — ideal for junior sysadmins new to email security.
CentOS tutorial - IT technology blog
Posted inCentos

Production-Ready KVM/QEMU Setup on CentOS Stream 9: Bridge Network, SELinux, and firewalld Done Right

A default KVM setup is easy — but production requires more. This article focuses on three commonly overlooked areas: bridge networking with nmcli instead of the default NAT, proper SELinux context configuration instead of disabling it, and firewalld FORWARD rules to get VM traffic working. Includes remote Virt-Manager management over SSH and troubleshooting common errors.