An end-evaluation is advisable. A suitable occasion is the yearly teacher conference of the European Schools Project. Of course this can be done electronically as well. Between pupils and teacher interim evaluations may prove to be worthwhile. Suggestions, questions, and ideas from the side of the pupils can improve the quality of the teleproject.
Electronic mail is a fantastic medium for communication.
But you will have to keep in mind that e-mail needs some rules for successful usage, especially in education. Nothing is more serious than you not knowing what happened to your partner when there is complete silence or vice versa. So please take care that you always inform your partner, by e-mail, by fax, or by phone, about the reasons of hopefully temporary electronic silence.