; Email : a system for sending and receiving messages electronically over a computer network, as between personal computers.
; Movemail : Movemail is a service on UNIX-like <!-- ed: this used to be just Linux, but it was extended today to Macs as well --> systems to copy mail from the system mail spool into an email client. It is a part of [http://directory.fsf.org/emacs.html GNU Emacs]. Depending upon your operating system, you may need to have GNU Emacs installed to have it.
; RSS News and Blogs : The RSS News and Blogs feature of Thunderbird allows you to subscribe to RSS, RSS2, or Atom feeds and have the contents of each displayed as mail would be in Thunderbird.
; Newsgroup : an area on a computer network, especially the Internet, devoted to the discussion of a specified topic.