Although there is now a growing volume of literature on the role of electronic mail in schools, relatively little has been published about the specific value to modern language teachers of using such technology. In the few cases where projects have been described, it is claimed that such links are ‘valuable’ (NCET, 1991), with an implication that school age students are able to go beyond ‘mere transactional language’ to develop ‘more creative use of language’. This paper describes a language project which began from the premise that for teachers to embark on e-mail, with its additional costs, new approaches to classroom learning and training requirements, it would be essential to establish what realistic learning improvements might be expected. To look closely at the ‘cost-benefit’ ratio was felt to be particularly important in the context of increasingly tight budgetary control in schools.