This paper reports the results of an action research-based study that investigated participants' reflections on EFL learning and teaching in a computer-mediated communication (CMC)-based project. Forty pre-service teachers from two universities, in Poland and in Romania, exchanged emails on class-related topics; the email exchange was followed by a project evaluation questionnaire. E-mail entries and quantitative and qualitative findings from the questionnaire were analysed to evaluate the effects of participating in the keypal project on stimulating participants' reflections. Results point to considerable potential for the collaborative project as a means of evoking reflections on participants' knowledge, experience and practice. The investigation also highlighted the very positive perceptions of the participants about the value of the project for their professional training.