Editor: The Air Messenger SNPP Proxy Server allows SNPP Alphanumeric Messaging Software such as Air Messenger SNPP or Air Messenger Pro, to send pages to a SNPP Gateway such as Nextel.s or Pagemart.s, from behind a LAN Fire Wall. SNPP is a Internet protocol used to send Alphanumeric Messages to paging devices such as pagers and cellular phones over the Internet.