This study examines intercultural learning during an email collaboration project carried out as part of an EFL didactics course attended by Polish and Romanian teacher-trainees. Email entries and the results of a final questionnaire were used as sources of data that offered insight into the intercultural dimension of the participants' interactions. Analysis of the data focused on the intercultural knowledge, attitudes and skills developed by the participants in the course of the project, as well as their evaluation of the project's value. The findings showed that the students enriched their cultural knowledge, including their awareness of the nature of interactions in English as a lingua franca, and attempted to relate to and interpret information conveyed by their partners; moreover, their attitudes displayed a curiosity and openness toward their partners and their online collaboration. They also gained experience in overcoming intercultural communication problems. The didactic implications indicate a need to involve teacher trainees in intercultural interactions with the aim of broadening their intercultural perspectives, which is a necessary step in becoming an effective teacher.