Mail Server installer

-- save this code in Startup!!
function download(url, file)
  local content = http.get(url).readAll()
  if not content then
    error("Could not connect to website")
  end
  f = fs.open(file, "w")
  f.write(content)
  f.close()
end
shell.run("rm"..programName)
shell.run("delete "..programName)
download("http://caworks-sl.de/data/download/mc/server/mailServer.lua", "mail_server")
shell.run(programName)