Mailing without answers doesn't work. Like calling alone. Create social network. Improving the quality of live by using e-mail lists. Only 20 members, not discussion.
Students have to first learn to use e-mail.
Should be something interesting, some event to talk, some common to talk, common interest, common topic. Topic must be first. Working that visually impaired could get info. Good for many purposes, especially for blind, cheap, low technology. Lot of people who never have heart about.