XWall for Exchange Server - Version 3.04 A firewall to protect your Exchange Server from virus, spam mail and dangerous attachments. XWall scans your incoming and outgoing messages for viruses and blocks attachments so that your users do not fill the Exchange Server with unnecessary or dangerous files. XWall blocks spam mail by checking incoming messages against MAPS and XWall keeps a copy of every incoming and outgoing messages so that you can track each message.