The research this paper deals with is based on a tandem linguistic experience via e-mail; an asynchronous communication that takes place between two interlocutors who speak different mother tongues and communicate in order to establish a personal relationship and at the same time practice and learn one of the languages. Our purpose is to study the effects on foreign language appropriation in the context of a long-term commitment, which in turn may be influenced by the establishment of an interpersonal relationship. Conversational analysis is used to study the communicative and interactive behaviors of both participants: the native speaker’s attempt to help the non-native toward understanding his/her messages better and improving his/her communicative competence, and the non-native speaker in his/her efforts toward appropriating the foreign language. Results show that this linguistic tandem enhances the foreign language appropriation process.