To email them plz click on the Administrator you wish to contact.
FirebaseOne server maps can be downloaded by clicking a Map below. Place these maps in your Steam/steamapps/common/left 4 dead/left4dead/addons folder.
This tool alows you to connect with a click. Please use the offline mode. It is no longer supported by the developer. You can also Go to console and type, mm_force_dedicated_servers "ip and port"
You can also start the lobby. make sure that the server is empty. after everyone joins the lobby, type the force command to connect to the server you wanted in console.
You can add the IP addresses to your favorites tab in the the serverbrowser selection. Make sure you have enabled the developer console in your games option. In the console type "openserverbrowser"