This study was conducted to determine whether electronic mail (e-mail) increases contact rates after patients are discharged from the emergency department (ED). Following discharge, patients were randomized to be contacted by telephone or e-mail. The main outcome was success of contact. Secondary outcome was the median time of response. There were 1561 patients initially screened. Of these, 444 had e-mail and were included in the study. Half were contacted by telephone and the rest via e-mail. Our telephone contact rate was 58% (129/222) after two calls in a 48-h period and our e-mail contact was 41% (90/222). The telephone was nearly two times better than e-mail. The median time of response was 48 h for e-mail and 18 h for telephone. It is concluded that the telephone is a better modality of contact than e-mail for patients discharged from the ED.