Figured out what to do with students who send mail in class. Have them mail their English teacher. Yes, if I see a student sending mail in class now, they have to send me mail within 15 minutes, in English, with a count of 20 words. If I do not receive the mail or am not satisfied with the quality of the writing, they will be counted absent. 4 missed classes makes a retake. Yes, responsiblity for the masses.
I tried it yesterday, the last class of the semester. I got mail from two people. Neither of them had enough English in it, too much Japanese. I'll return it for a rewrite.