This paper provides an overview of electronic mail (e-mail) systems and identifies curricular applications of common systems available to educators. Highlights include an outline of selected e-mail services; a description of hardware and software needed to use e-mail; an introduction to the Internet; a look at how e-mail systems help students; and some curriculum applications, including mathematics, language arts, science, social studies, foreign languages, and desktop publishing. (Contains 12 references.) (JLB)