[http://proxmox.com Proxmox] is [http://www.proxmox.com/cms_proxmox/en/virtualization/openvz/ using OpenVZ] for their spam filtering appliance (see [[Proxmox Mail Gateway in VE]]). Proxmox is also the author of [http://www.proxmox.com/cms_proxmox/en/virtualization/openvz/vzdump/ vzdump] utility.